diff --git a/dist/flow.js b/dist/flow.js
index e101a12..e0ce962 100644
--- a/dist/flow.js
+++ b/dist/flow.js
@@ -5892,31 +5892,41 @@
       key: "readStreamChunk",
       value: function () {
         var _readStreamChunk = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee3() {
-          var data, asyncRead, lastReadBytes;
+          var data, asyncRead;
           return regeneratorRuntime.wrap(function _callee3$(_context3) {
             while (1) {
               switch (_context3.prev = _context3.next) {
                 case 0:
                   if (!this.readStreamState.resolved) {
-                    _context3.next = 3;
+                    _context3.next = 6;
                     break;
                   }
 
-                  // This is normally impossible to reach. Has it been uploaded?
-                  console.warn("Chunk ".concat(this.offset, " already read. xhr initialized = ").concat(this.xhr ? 1 : 0)); // We may want to retry (or not) to upload (but never try to read from the stream again or risk misordered chunks
+                  if (!(this.payload && this.pendingRetry)) {
+                    _context3.next = 4;
+                    break;
+                  }
 
-                  return _context3.abrupt("return");
+                  console.info("Retrying chunk ".concat(this.offset, " upload"));
+                  return _context3.abrupt("return", this.uploadStreamChunk(this.payload));
 
-                case 3:
-                  _context3.next = 5;
+                case 4:
+                  console.warn("Chunk ".concat(this.offset, " already read. xhr initialized = ").concat(this.xhr ? 1 : 0, ". payload size = ").concat(this.payload ? this.payload.size : null, ". readState = ").concat(this.readState, ". retry = ").concat(this.pendingRetry)); // ... but never try to read that same chunk from the (non-rewindable) stream again or we'd risk
+                  // not only misordered chunks but a corrupted file.
+
+                  return _context3.abrupt("return", null);
+
+                case 6:
+                  this.readState = 1;
+                  _context3.next = 9;
                   return this.readStreamGuard();
 
-                case 5:
+                case 9:
                   asyncRead = this.flowObj.opts.asyncReadFileFn;
-                  _context3.next = 8;
+                  _context3.next = 12;
                   return asyncRead(this.fileObj, this.startByte, this.endByte, this.fileObj.file.type, this);
 
-                case 8:
+                case 12:
                   data = _context3.sent;
                   this.readStreamState.resolve(); // Equivalent to readFinished()
 
@@ -5926,23 +5936,48 @@
                     this.readBytes = data.size || data.size === 0 ? data.size : -1;
                   }
 
+                  return _context3.abrupt("return", this.uploadStreamChunk(data));
+
+                case 17:
+                case "end":
+                  return _context3.stop();
+              }
+            }
+          }, _callee3, this);
+        }));
+
+        function readStreamChunk() {
+          return _readStreamChunk.apply(this, arguments);
+        }
+
+        return readStreamChunk;
+      }()
+    }, {
+      key: "uploadStreamChunk",
+      value: function () {
+        var _uploadStreamChunk = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee4(data) {
+          var lastReadBytes;
+          return regeneratorRuntime.wrap(function _callee4$(_context4) {
+            while (1) {
+              switch (_context4.prev = _context4.next) {
+                case 0:
                   if (!(data && data.size > 0)) {
-                    _context3.next = 17;
+                    _context4.next = 5;
                     break;
                   }
 
-                  if (this.flowObj.chunkSize) {
+                  if (this.fileObj.chunkSize && data.size > this.fileObj.chunkSize) {
                     // This may imply a miscalculation of the total chunk numbers.
                     console.warn("Chunk ".concat(this.offset, ": returned too much data. Got ").concat(data.size, ". Expected not more than ").concat(this.flowObj.chunkSize, "."));
                   }
 
                   this.payload = data;
                   this.xhrSend(data);
-                  return _context3.abrupt("return");
+                  return _context4.abrupt("return");
 
-                case 17:
+                case 5:
                   if (!(this.offset > 0)) {
-                    _context3.next = 25;
+                    _context4.next = 13;
                     break;
                   }
 
@@ -5950,7 +5985,7 @@
                   lastReadBytes = this.fileObj.chunks[this.offset - 1].readBytes;
 
                   if (!(lastReadBytes < parseInt(this.chunkSize))) {
-                    _context3.next = 25;
+                    _context4.next = 13;
                     break;
                   }
 
@@ -5961,29 +5996,32 @@
 
                   this.pendingRetry = false;
                   this.xhr = {
-                    readyState: 5,
-                    status: 1
+                    readyState: 4,
+                    status: 200,
+                    abort: function abort(e) {
+                      return null;
+                    }
                   };
                   this.doneHandler(null);
-                  return _context3.abrupt("return");
+                  return _context4.abrupt("return");
 
-                case 25:
+                case 13:
                   console.warn("Chunk ".concat(this.offset, ": no byte to read()"));
                   this.pendingRetry = false;
 
-                case 27:
+                case 15:
                 case "end":
-                  return _context3.stop();
+                  return _context4.stop();
               }
             }
-          }, _callee3, this);
+          }, _callee4, this);
         }));
 
-        function readStreamChunk() {
-          return _readStreamChunk.apply(this, arguments);
+        function uploadStreamChunk(_x) {
+          return _uploadStreamChunk.apply(this, arguments);
         }
 
-        return readStreamChunk;
+        return uploadStreamChunk;
       }()
       /**
        * Prepare data (preprocess/read) data then call xhrSend()
@@ -5993,68 +6031,67 @@
     }, {
       key: "send",
       value: function () {
-        var _send = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee4() {
+        var _send = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee5() {
           var preprocess, read, asyncRead;
-          return regeneratorRuntime.wrap(function _callee4$(_context4) {
+          return regeneratorRuntime.wrap(function _callee5$(_context5) {
             while (1) {
-              switch (_context4.prev = _context4.next) {
+              switch (_context5.prev = _context5.next) {
                 case 0:
                   preprocess = this.flowObj.opts.preprocess;
                   read = this.flowObj.opts.readFileFn;
                   asyncRead = this.flowObj.opts.asyncReadFileFn;
 
                   if (!(typeof preprocess === 'function')) {
-                    _context4.next = 11;
+                    _context5.next = 11;
                     break;
                   }
 
-                  _context4.t0 = this.preprocessState;
-                  _context4.next = _context4.t0 === 0 ? 7 : _context4.t0 === 1 ? 10 : 11;
+                  _context5.t0 = this.preprocessState;
+                  _context5.next = _context5.t0 === 0 ? 7 : _context5.t0 === 1 ? 10 : 11;
                   break;
 
                 case 7:
                   this.preprocessState = 1;
                   preprocess(this);
-                  return _context4.abrupt("return");
+                  return _context5.abrupt("return");
 
                 case 10:
-                  return _context4.abrupt("return");
+                  return _context5.abrupt("return");
 
                 case 11:
                   if (!asyncRead) {
-                    _context4.next = 16;
+                    _context5.next = 15;
                     break;
                   }
 
-                  this.readState = 1;
-                  _context4.next = 15;
+                  _context5.next = 14;
                   return this.readStreamChunk();
 
-                case 15:
-                  return _context4.abrupt("return");
+                case 14:
+                  return _context5.abrupt("return");
 
-                case 16:
-                  _context4.t1 = this.readState;
-                  _context4.next = _context4.t1 === 0 ? 19 : _context4.t1 === 1 ? 22 : 23;
+                case 15:
+                  _context5.t1 = this.readState;
+                  _context5.next = _context5.t1 === 0 ? 18 : _context5.t1 === 1 ? 21 : 22;
                   break;
 
-                case 19:
+                case 18:
                   this.readState = 1;
                   read(this.fileObj, this.startByte, this.endByte, this.fileObj.file.type, this);
-                  return _context4.abrupt("return");
+                  return _context5.abrupt("return");
 
-                case 22:
-                  return _context4.abrupt("return");
+                case 21:
+                  return _context5.abrupt("return");
 
-                case 23:
+                case 22:
                   this.xhrSend(this.payload);
 
-                case 24:
+                case 23:
                 case "end":
-                  return _context4.stop();
+                  return _context5.stop();
               }
             }
-          }, _callee4, this);
+          }, _callee5, this);
         }));
 
         function send() {
@@ -6102,13 +6139,11 @@
     }, {
       key: "abort",
       value: function abort() {
-        // Abort and reset
-        var xhr = this.xhr;
-        this.xhr = null;
-
-        if (xhr) {
-          xhr.abort();
+        if (this.xhr) {
+          this.xhr.abort();
         }
+
+        this.xhr = null;
       }
       /**
        * Retrieve current chunk upload status
@@ -6772,6 +6807,34 @@
 
         return bootstrap;
       }()
+      /**
+       * Indicates if string is being read at the moment
+       * @function
+       * @returns {boolean}
+       */
+
+    }, {
+      key: "isReading",
+      value: function isReading() {
+        var _iterator = _createForOfIteratorHelper(this.chunks),
+            _step;
+
+        try {
+          for (_iterator.s(); !(_step = _iterator.n()).done;) {
+            var chunk = _step.value;
+
+            if (chunk.status() === 'reading') {
+              return true;
+            }
+          }
+        } catch (err) {
+          _iterator.e(err);
+        } finally {
+          _iterator.f();
+        }
+
+        return false;
+      }
     }]);
 
     return AsyncFlowFile;
@@ -6919,6 +6982,55 @@
           this.addFiles(dataTransfer.files, event);
         }
       }
+      /**
+       * On drop event when file/stream initialization is asynchronous
+       * @function
+       * @param {MouseEvent} event
+       */
+
+    }, {
+      key: "asyncOnDrop",
+      value: function () {
+        var _asyncOnDrop = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee(event) {
+          var dataTransfer;
+          return regeneratorRuntime.wrap(function _callee$(_context) {
+            while (1) {
+              switch (_context.prev = _context.next) {
+                case 0:
+                  if (this.opts.onDropStopPropagation) {
+                    event.stopPropagation();
+                  }
+
+                  event.preventDefault();
+                  dataTransfer = event.dataTransfer;
+
+                  if (!(dataTransfer.items && dataTransfer.items[0] && dataTransfer.items[0].webkitGetAsEntry)) {
+                    _context.next = 7;
+                    break;
+                  }
+
+                  this.webkitReadDataTransfer(event);
+                  _context.next = 9;
+                  break;
+
+                case 7:
+                  _context.next = 9;
+                  return this.asyncAddFiles(dataTransfer.files, event);
+
+                case 9:
+                case "end":
+                  return _context.stop();
+              }
+            }
+          }, _callee, this);
+        }));
+
+        function asyncOnDrop(_x) {
+          return _asyncOnDrop.apply(this, arguments);
+        }
+
+        return asyncOnDrop;
+      }()
       /**
        * Prevent default
        * @function
@@ -7217,14 +7329,46 @@
           each(attributes, function (value, key) {
             input.setAttribute(key, value);
           }); // When new files are added, simply append them to the overall list
+          // but adapt to the case where initFileFn is async.
+
+          var callback = this.opts.initFileFn && typeof this.opts.initFileFn === 'function' && this.opts.initFileFn.constructor.name === 'AsyncFunction' ? /*#__PURE__*/function () {
+            var _ref = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2(e) {
+              return regeneratorRuntime.wrap(function _callee2$(_context2) {
+                while (1) {
+                  switch (_context2.prev = _context2.next) {
+                    case 0:
+                      if (!e.target.value) {
+                        _context2.next = 6;
+                        break;
+                      }
+
+                      input.setAttribute('readonly', 'readonly');
+                      _context2.next = 4;
+                      return _this3.asyncAddFiles(e.target.files, e);
+
+                    case 4:
+                      e.target.value = '';
+                      input.removeAttribute('readonly');
 
-          input.addEventListener('change', function (e) {
+                    case 6:
+                    case "end":
+                      return _context2.stop();
+                  }
+                }
+              }, _callee2);
+            }));
+
+            return function (_x2) {
+              return _ref.apply(this, arguments);
+            };
+          }() : function (e) {
             if (e.target.value) {
               _this3.addFiles(e.target.files, e);
 
               e.target.value = '';
             }
-          }, false);
+          };
+          input.addEventListener('change', callback, false);
         }, this);
       }
       /**
@@ -7240,7 +7384,7 @@
           domNodes = [domNodes];
         }
 
-        this._onDropBound = this.onDrop.bind(this);
+        this._onDropBound = this.opts.initFileFn && typeof this.opts.initFileFn === 'function' && this.opts.initFileFn.constructor.name === 'AsyncFunction' ? this.asyncOnDrop.bind(this) : this.onDrop.bind(this);
 
         var _iterator7 = _createForOfIteratorHelper(domNodes),
             _step7;
@@ -7427,78 +7571,78 @@
       value: /*#__PURE__*/regeneratorRuntime.mark(function filterFileList(fileList, event) {
         var ie10plus, _iterator9, _step9, file, uniqueIdentifier;
 
-        return regeneratorRuntime.wrap(function filterFileList$(_context) {
+        return regeneratorRuntime.wrap(function filterFileList$(_context3) {
           while (1) {
-            switch (_context.prev = _context.next) {
+            switch (_context3.prev = _context3.next) {
               case 0:
                 // ie10+
                 ie10plus = window.navigator.msPointerEnabled;
                 _iterator9 = _createForOfIteratorHelper(fileList);
-                _context.prev = 2;
+                _context3.prev = 2;
 
                 _iterator9.s();
 
               case 4:
                 if ((_step9 = _iterator9.n()).done) {
-                  _context.next = 17;
+                  _context3.next = 17;
                   break;
                 }
 
                 file = _step9.value;
 
                 if (!(ie10plus && file.size === 0 || file.size % 4096 === 0 && (file.name === '.' || file.fileName === '.'))) {
-                  _context.next = 8;
+                  _context3.next = 8;
                   break;
                 }
 
-                return _context.abrupt("continue", 15);
+                return _context3.abrupt("continue", 15);
 
               case 8:
                 uniqueIdentifier = this.generateUniqueIdentifier(file);
 
                 if (!(!this.opts.allowDuplicateUploads && this.getFromUniqueIdentifier(uniqueIdentifier))) {
-                  _context.next = 11;
+                  _context3.next = 11;
                   break;
                 }
 
-                return _context.abrupt("continue", 15);
+                return _context3.abrupt("continue", 15);
 
               case 11:
                 if (this.hook('filter-file', file, event)) {
-                  _context.next = 13;
+                  _context3.next = 13;
                   break;
                 }
 
-                return _context.abrupt("continue", 15);
+                return _context3.abrupt("continue", 15);
 
               case 13:
-                _context.next = 15;
+                _context3.next = 15;
                 return [file, uniqueIdentifier];
 
               case 15:
-                _context.next = 4;
+                _context3.next = 4;
                 break;
 
               case 17:
-                _context.next = 22;
+                _context3.next = 22;
                 break;
 
               case 19:
-                _context.prev = 19;
-                _context.t0 = _context["catch"](2);
+                _context3.prev = 19;
+                _context3.t0 = _context3["catch"](2);
 
-                _iterator9.e(_context.t0);
+                _iterator9.e(_context3.t0);
 
               case 22:
-                _context.prev = 22;
+                _context3.prev = 22;
 
                 _iterator9.f();
 
-                return _context.finish(22);
+                return _context3.finish(22);
 
               case 25:
               case "end":
-                return _context.stop();
+                return _context3.stop();
             }
           }
         }, filterFileList, this, [[2, 19, 22, 25]]);
@@ -7599,35 +7743,35 @@
     }, {
       key: "asyncAddFile",
       value: function () {
-        var _asyncAddFile = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee(file) {
+        var _asyncAddFile = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee3(file) {
           var _len2,
               args,
               _key2,
-              _args2 = arguments;
+              _args4 = arguments;
 
-          return regeneratorRuntime.wrap(function _callee$(_context2) {
+          return regeneratorRuntime.wrap(function _callee3$(_context4) {
             while (1) {
-              switch (_context2.prev = _context2.next) {
+              switch (_context4.prev = _context4.next) {
                 case 0:
-                  for (_len2 = _args2.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
-                    args[_key2 - 1] = _args2[_key2];
+                  for (_len2 = _args4.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
+                    args[_key2 - 1] = _args4[_key2];
                   }
 
-                  _context2.next = 3;
+                  _context4.next = 3;
                   return this.asyncAddFiles.apply(this, [[file]].concat(args));
 
                 case 3:
-                  return _context2.abrupt("return", _context2.sent[0]);
+                  return _context4.abrupt("return", _context4.sent[0]);
 
                 case 4:
                 case "end":
-                  return _context2.stop();
+                  return _context4.stop();
               }
             }
-          }, _callee, this);
+          }, _callee3, this);
         }));
 
-        function asyncAddFile(_x) {
+        function asyncAddFile(_x3) {
           return _asyncAddFile.apply(this, arguments);
         }
 
@@ -7645,7 +7789,7 @@
     }, {
       key: "asyncAddFiles",
       value: function () {
-        var _asyncAddFiles = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2(fileList) {
+        var _asyncAddFiles = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee4(fileList) {
           var event,
               initFileFn,
               item,
@@ -7663,90 +7807,90 @@
               _iterator12,
               _step12,
               _file3,
-              _args3 = arguments;
+              _args5 = arguments;
 
-          return regeneratorRuntime.wrap(function _callee2$(_context3) {
+          return regeneratorRuntime.wrap(function _callee4$(_context5) {
             while (1) {
-              switch (_context3.prev = _context3.next) {
+              switch (_context5.prev = _context5.next) {
                 case 0:
-                  event = _args3.length > 1 && _args3[1] !== undefined ? _args3[1] : null;
-                  initFileFn = _args3.length > 2 && _args3[2] !== undefined ? _args3[2] : this.opts.initFileFn;
+                  event = _args5.length > 1 && _args5[1] !== undefined ? _args5[1] : null;
+                  initFileFn = _args5.length > 2 && _args5[2] !== undefined ? _args5[2] : this.opts.initFileFn;
                   states = [];
                   iterator = this.filterFileList(fileList, event);
 
                 case 4:
                   if (!((item = iterator.next()) && !item.done)) {
-                    _context3.next = 16;
+                    _context5.next = 16;
                     break;
                   }
 
                   _item$value2 = _slicedToArray(item.value, 2);
                   file = _item$value2[0];
                   uniqueIdentifier = _item$value2[1];
-                  _context3.next = 10;
+                  _context5.next = 10;
                   return this.aHook('filter-file', file, event);
 
                 case 10:
-                  if (_context3.sent) {
-                    _context3.next = 12;
+                  if (_context5.sent) {
+                    _context5.next = 12;
                     break;
                   }
 
-                  return _context3.abrupt("continue", 4);
+                  return _context5.abrupt("continue", 4);
 
                 case 12:
                   // ToDo: parallelizable ?
                   flowFile = new AsyncFlowFile(this, file, uniqueIdentifier), state = flowFile.bootstrap(event, initFileFn);
                   states.push(state);
-                  _context3.next = 4;
+                  _context5.next = 4;
                   break;
 
                 case 16:
-                  _context3.next = 18;
+                  _context5.next = 18;
                   return Promise.all(states);
 
                 case 18:
-                  flowfiles = _context3.sent;
+                  flowfiles = _context5.sent;
                   _iterator11 = _createForOfIteratorHelper(flowfiles);
-                  _context3.prev = 20;
+                  _context5.prev = 20;
 
                   _iterator11.s();
 
                 case 22:
                   if ((_step11 = _iterator11.n()).done) {
-                    _context3.next = 29;
+                    _context5.next = 29;
                     break;
                   }
 
                   ff = _step11.value;
                   this.hook('file-added', ff, event);
-                  _context3.next = 27;
+                  _context5.next = 27;
                   return this.aHook('file-added', ff, event);
 
                 case 27:
-                  _context3.next = 22;
+                  _context5.next = 22;
                   break;
 
                 case 29:
-                  _context3.next = 34;
+                  _context5.next = 34;
                   break;
 
                 case 31:
-                  _context3.prev = 31;
-                  _context3.t0 = _context3["catch"](20);
+                  _context5.prev = 31;
+                  _context5.t0 = _context5["catch"](20);
 
-                  _iterator11.e(_context3.t0);
+                  _iterator11.e(_context5.t0);
 
                 case 34:
-                  _context3.prev = 34;
+                  _context5.prev = 34;
 
                   _iterator11.f();
 
-                  return _context3.finish(34);
+                  return _context5.finish(34);
 
                 case 37:
                   this.hook('files-added', flowfiles, event);
-                  _context3.next = 40;
+                  _context5.next = 40;
                   return this.aHook('files-added', flowfiles, event);
 
                 case 40:
@@ -7772,21 +7916,21 @@
                   }
 
                   this.hook('files-submitted', this.files, event);
-                  _context3.next = 46;
+                  _context5.next = 46;
                   return this.aHook('files-submitted', this.files, event);
 
                 case 46:
-                  return _context3.abrupt("return", flowfiles);
+                  return _context5.abrupt("return", flowfiles);
 
                 case 47:
                 case "end":
-                  return _context3.stop();
+                  return _context5.stop();
               }
             }
-          }, _callee2, this, [[20, 31, 34, 37]]);
+          }, _callee4, this, [[20, 31, 34, 37]]);
         }));
 
-        function asyncAddFiles(_x2) {
+        function asyncAddFiles(_x4) {
           return _asyncAddFiles.apply(this, arguments);
         }
 
diff --git a/dist/flow.min.js b/dist/flow.min.js
index a46266b..ceea935 100644
--- a/dist/flow.min.js
+++ b/dist/flow.min.js
@@ -1,3 +1,3 @@
 /*! @flowjs/flow.js 3.0.0-alpha.0 */
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).Flow=e()}(this,(function(){"use strict";function t(e){return(t="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t})(e)}function e(t,e,r,n,i,o,a){try{var s=t[o](a),u=s.value}catch(t){return void r(t)}s.done?e(u):Promise.resolve(u).then(n,i)}function r(t){return function(){var r=this,n=arguments;return new Promise((function(i,o){var a=t.apply(r,n);function s(t){e(a,i,o,s,u,"next",t)}function u(t){e(a,i,o,s,u,"throw",t)}s(void 0)}))}}function n(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}function i(t,e){for(var r=0;r<e.length;r++){var n=e[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in 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this._bootstrap(),"retry"!==e&&this.flowObj.hook("file-added",this,e),t.abrupt("return",this);case 8:case"end":return t.stop()}}),t,this)}))),function(){return e.apply(this,arguments)})},{key:"isReading",value:function(){var t,e=w(this.chunks);try{for(e.s();!(t=e.n()).done;){if("reading"===t.value.status())return!0}}catch(t){e.e(t)}finally{e.f()}return!1}}]),s}(),ts=function(t){c(u,Do);var e,i,a,s=y(u);function u(t,e){var r;return n(this,u),r=s.call(this,e),u.version="3.0.0-alpha.0",r.supportDirectory=/Chrome/.test(window.navigator.userAgent)||/Firefox/.test(window.navigator.userAgent)||/Edge/.test(window.navigator.userAgent),r.files=[],r.defaults={chunkSize:1048576,forceChunkSize:!1,simultaneousUploads:3,singleFile:!1,fileParameterName:"file",progressCallbacksInterval:500,speedSmoothingFactor:.1,query:{},headers:{},withCredentials:!1,preprocess:null,changeRawDataBeforeSend:null,method:"multipart",testMethod:"GET",uploadMethod:"POST",prioritizeFirstAndLastChunk:!1,allowDuplicateUploads:!1,target:"/",testChunks:!0,generateUniqueIdentifier:null,maxChunkRetries:0,chunkRetryInterval:null,permanentErrors:[404,413,415,500,501],successStatuses:[200,201,202],onDropStopPropagation:!1,initFileFn:null,readFileFn:na,asyncReadFileFn:null},r.opts={},r.opts=Object.assign({},r.defaults,t||{}),r._onDropBound=null,r}return o(u,[{key:"onDrop",value:function(t){this.opts.onDropStopPropagation&&t.stopPropagation(),t.preventDefault();var e=t.dataTransfer;e.items&&e.items[0]&&e.items[0].webkitGetAsEntry?this.webkitReadDataTransfer(t):this.addFiles(e.files,t)}},{key:"asyncOnDrop",value:(a=r(regeneratorRuntime.mark((function t(e){var r;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:if(this.opts.onDropStopPropagation&&e.stopPropagation(),e.preventDefault(),!((r=e.dataTransfer).items&&r.items[0]&&r.items[0].webkitGetAsEntry)){t.next=7;break}this.webkitReadDataTransfer(e),t.next=9;break;case 7:return t.next=9,this.asyncAddFiles(r.files,e);case 9:case"end":return t.stop()}}),t,this)}))),function(t){return a.apply(this,arguments)})},{key:"preventEvent",value:function(t){t.preventDefault()}},{key:"webkitReadDataTransfer",value:function(t){var e,r=this,n=t.dataTransfer.items.length,i=function(){0==--n&&r.addFiles(o,t)},o=[],a=w(t.dataTransfer.items);try{for(a.s();!(e=a.n()).done;){var s=e.value,u=s.webkitGetAsEntry();if(!u)return void i();u.isFile?l(s.getAsFile(),u.fullPath):c(u.createReader())}}catch(t){a.e(t)}finally{a.f()}function c(t){t.readEntries((function(e){if(e.length){n+=e.length;var r,o={},a=w(e);try{for(a.s();!(r=a.n()).done;){var s=r.value;s.isFile?(o[s.name]=s.fullPath,s.file((function(t){return l(t,o[t.name])}),f)):s.isDirectory&&c(s.createReader())}}catch(t){a.e(t)}finally{a.f()}c(t)}else i()}),f)}function l(t,e){t.relativePath=e.substring(1),o.push(t),i()}function f(t){throw i(),t}}},{key:"generateUniqueIdentifier",value:function(t){var e=this.opts.generateUniqueIdentifier;if("function"==typeof e)return e(t);var r=t.relativePath||t.webkitRelativePath||t.fileName||t.name;return t.size+"-"+r.replace(/[^0-9a-zA-Z_-]/gim,"")}},{key:"uploadNextChunk",value:function(t){var e=!1;if(this.opts.prioritizeFirstAndLastChunk){var r,n=w(this.files);try{for(n.s();!(r=n.n()).done;){var i=r.value;if(!i.paused&&i.chunks.length&&"pending"===i.chunks[0].status()){i.chunks[0].send(),e=!0;break}if(!i.paused&&i.chunks.length>1&&"pending"===i.chunks[i.chunks.length-1].status()){i.chunks[i.chunks.length-1].send(),e=!0;break}}}catch(t){n.e(t)}finally{n.f()}if(e)return e}var o,a=w(this.files);try{t:for(a.s();!(o=a.n()).done;){var s=o.value;if(!s.paused){var u,c=w(s.chunks);try{for(c.s();!(u=c.n()).done;){var l=u.value;if("pending"===l.status()){l.send(),e=!0;break t}}}catch(t){c.e(t)}finally{c.f()}}}}catch(t){a.e(t)}finally{a.f()}if(e)return!0;var f,h=!1,p=w(this.files);try{for(p.s();!(f=p.n()).done;){if(!f.value.isComplete()){h=!0;break}}}catch(t){p.e(t)}finally{p.f()}return h||t||this.emit("complete"),!1}},{key:"assignBrowse",value:function(t,e,n,i){t instanceof Element&&(t=[t]),oa(t,(function(t){var o,a=this;"INPUT"===t.tagName&&"file"===t.type?o=t:((o=document.createElement("input")).setAttribute("type","file"),Object.assign(o.style,{visibility:"hidden",position:"absolute",width:"1px",height:"1px"}),t.appendChild(o),t.addEventListener("click",(function(){o.click()}),!1)),this.opts.singleFile||n||o.setAttribute("multiple","multiple"),e&&o.setAttribute("webkitdirectory","webkitdirectory"),oa(i,(function(t,e){o.setAttribute(e,t)}));var s=this.opts.initFileFn&&"function"==typeof this.opts.initFileFn&&"AsyncFunction"===this.opts.initFileFn.constructor.name?function(){var t=r(regeneratorRuntime.mark((function t(e){return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:if(!e.target.value){t.next=6;break}return o.setAttribute("readonly","readonly"),t.next=4,a.asyncAddFiles(e.target.files,e);case 4:e.target.value="",o.removeAttribute("readonly");case 6:case"end":return t.stop()}}),t)})));return function(e){return t.apply(this,arguments)}}():function(t){t.target.value&&(a.addFiles(t.target.files,t),t.target.value="")};o.addEventListener("change",s,!1)}),this)}},{key:"assignDrop",value:function(t){void 0===t.length&&(t=[t]),this._onDropBound=this.opts.initFileFn&&"function"==typeof this.opts.initFileFn&&"AsyncFunction"===this.opts.initFileFn.constructor.name?this.asyncOnDrop.bind(this):this.onDrop.bind(this);var e,r=w(t);try{for(r.s();!(e=r.n()).done;){var n=e.value;n.addEventListener("dragover",this.preventEvent,!1),n.addEventListener("dragenter",this.preventEvent,!1),n.addEventListener("drop",this._onDropBound,!1)}}catch(t){r.e(t)}finally{r.f()}}},{key:"unAssignDrop",value:function(t){void 0===t.length&&(t=[t]);var e,r=w(t);try{for(r.s();!(e=r.n()).done;){var n=e.value;n.removeEventListener("dragover",this.preventEvent,!1),n.removeEventListener("dragenter",this.preventEvent,!1),n.removeEventListener("drop",this._onDropBound,!1)}}catch(t){r.e(t)}finally{r.f()}}},{key:"isUploading",value:function(){var t=!1;return oa(this.files,(function(e){if(e.isUploading())return t=!0,!1})),t}},{key:"_shouldUploadNext",value:function(){var t=0,e=!0,r=this.opts.simultaneousUploads;return oa(this.files,(function(n){oa(n.chunks,(function(n){if("uploading"===n.status()&&++t>=r)return e=!1,!1}))})),e&&t}},{key:"upload",value:function(){var t=this._shouldUploadNext();if(!1!==t){this.emit("upload-start");for(var e=!1,r=1;r<=this.opts.simultaneousUploads-t;r++)e=this.uploadNextChunk(!0)||e;e||this.emit("complete")}}},{key:"resume",value:function(){oa(this.files,(function(t){t.isComplete()||t.resume()}))}},{key:"pause",value:function(){oa(this.files,(function(t){t.pause()}))}},{key:"cancel",value:function(){for(var t=this.files.length-1;t>=0;t--)this.files[t].cancel()}},{key:"progress",value:function(){var t=0,e=0;return oa(this.files,(function(r){t+=r.progress()*r.size,e+=r.size})),e>0?t/e:0}},{key:"filterFileList",value:regeneratorRuntime.mark((function t(e,r){var n,i,o,a,s;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:n=window.navigator.msPointerEnabled,i=w(e),t.prev=2,i.s();case 4:if((o=i.n()).done){t.next=17;break}if(a=o.value,!(n&&0===a.size||a.size%4096==0&&("."===a.name||"."===a.fileName))){t.next=8;break}return t.abrupt("continue",15);case 8:if(s=this.generateUniqueIdentifier(a),this.opts.allowDuplicateUploads||!this.getFromUniqueIdentifier(s)){t.next=11;break}return t.abrupt("continue",15);case 11:if(this.hook("filter-file",a,r)){t.next=13;break}return t.abrupt("continue",15);case 13:return t.next=15,[a,s];case 15:t.next=4;break;case 17:t.next=22;break;case 19:t.prev=19,t.t0=t.catch(2),i.e(t.t0);case 22:return t.prev=22,i.f(),t.finish(22);case 25:case"end":return t.stop()}}),t,this,[[2,19,22,25]])}))},{key:"addFile",value:function(t){for(var e=arguments.length,r=new Array(e>1?e-1:0),n=1;n<e;n++)r[n-1]=arguments[n];this.addFiles.apply(this,[[t]].concat(r))}},{key:"addFiles",value:function(t){var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:null,r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:this.opts.initFileFn;this.hasHook(!0)&&console.warn("Using addFiles() while settings asynchronous events can lead to unpredictable results. Use asyncAddFiles() instead.");for(var n,i,o,a=[],s=this.filterFileList(t,e);(n=s.next())&&!n.done;){var u=g(n.value,2);i=u[0],o=u[1];var c=new Za(this,i,o);c.bootstrap(e,r),this.hook("file-added",c,e),this.aHook("file-added",c,e),c.file&&a.push(c)}this.hook("files-added",a,e),this.aHook("files-added",a,e);var l,f=w(a=a.filter((function(t){return t})));try{for(f.s();!(l=f.n()).done;)i=l.value,this.opts.singleFile&&this.files.length>0&&this.removeFile(this.files[0]),this.files.push(i)}catch(t){f.e(t)}finally{f.f()}this.hook("files-submitted",this.files,e),this.aHook("files-submitted",this.files,e)}},{key:"asyncAddFile",value:(i=r(regeneratorRuntime.mark((function t(e){var r,n,i,o=arguments;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:for(r=o.length,n=new Array(r>1?r-1:0),i=1;i<r;i++)n[i-1]=o[i];return t.next=3,this.asyncAddFiles.apply(this,[[e]].concat(n));case 3:return t.abrupt("return",t.sent[0]);case 4:case"end":return t.stop()}}),t,this)}))),function(t){return i.apply(this,arguments)})},{key:"asyncAddFiles",value:(e=r(regeneratorRuntime.mark((function t(e){var r,n,i,o,a,s,u,c,l,f,h,p,d,v,y,m,b,k=arguments;return regeneratorRuntime.wrap((function(t){for(;;)switch(t.prev=t.next){case 0:r=k.length>1&&void 0!==k[1]?k[1]:null,n=k.length>2&&void 0!==k[2]?k[2]:this.opts.initFileFn,s=[],u=this.filterFileList(e,r);case 4:if(!(i=u.next())||i.done){t.next=16;break}return c=g(i.value,2),o=c[0],a=c[1],t.next=10,this.aHook("filter-file",o,r);case 10:if(t.sent){t.next=12;break}return t.abrupt("continue",4);case 12:l=new Qa(this,o,a),f=l.bootstrap(r,n),s.push(f),t.next=4;break;case 16:return t.next=18,Promise.all(s);case 18:h=t.sent,p=w(h),t.prev=20,p.s();case 22:if((d=p.n()).done){t.next=29;break}return v=d.value,this.hook("file-added",v,r),t.next=27,this.aHook("file-added",v,r);case 27:t.next=22;break;case 29:t.next=34;break;case 31:t.prev=31,t.t0=t.catch(20),p.e(t.t0);case 34:return t.prev=34,p.f(),t.finish(34);case 37:return this.hook("files-added",h,r),t.next=40,this.aHook("files-added",h,r);case 40:h=h.filter((function(t){return t&&t.file})),y=w(h);try{for(y.s();!(m=y.n()).done;)b=m.value,this.opts.singleFile&&this.files.length>0&&this.removeFile(this.files[0]),this.files.push(b)}catch(t){y.e(t)}finally{y.f()}return this.hook("files-submitted",this.files,r),t.next=46,this.aHook("files-submitted",this.files,r);case 46:return t.abrupt("return",h);case 47:case"end":return t.stop()}}),t,this,[[20,31,34,37]])}))),function(t){return e.apply(this,arguments)})},{key:"removeFile",value:function(t){for(var e=this.files.length-1;e>=0;e--)this.files[e]===t&&(this.files.splice(e,1),t.abort(),this.emit("file-removed",t))}},{key:"getFromUniqueIdentifier",value:function(t){var e=!1;return oa(this.files,(function(r){r.uniqueIdentifier===t&&(e=r)})),e}},{key:"getSize",value:function(){var t=0;return oa(this.files,(function(e){t+=e.size})),t}},{key:"sizeUploaded",value:function(){var t=0;return oa(this.files,(function(e){t+=e.sizeUploaded()})),t}},{key:"timeRemaining",value:function(){var t=0,e=0;return oa(this.files,(function(r){r.paused||r.error||(t+=r.size-r.sizeUploaded(),e+=r.averageSpeed)})),t&&!e?Number.POSITIVE_INFINITY:t||e?Math.floor(t/e):0}}]),u}();export default ts;
 //# sourceMappingURL=flow.min.js.map
diff --git a/src/AsyncFlowFile.js b/src/AsyncFlowFile.js
index 7a3ee80..c6dc6b4 100644
--- a/src/AsyncFlowFile.js
+++ b/src/AsyncFlowFile.js
@@ -33,4 +33,18 @@ export default class AsyncFlowFile extends FlowFile {
     // console.log("Flowfile returns [async]", this._bootstrapped);
     return this;
   }
+
+  /**
+   * Indicates if string is being read at the moment
+   * @function
+   * @returns {boolean}
+   */
+  isReading() {
+    for (let chunk of this.chunks) {
+      if (chunk.status() === 'reading') {
+        return true;
+      }
+    }
+    return false;
+  }
 }
diff --git a/src/FlowChunk.js b/src/FlowChunk.js
index 82e2ffc..576c4fe 100644
--- a/src/FlowChunk.js
+++ b/src/FlowChunk.js
@@ -307,12 +307,20 @@ export default class FlowChunk {
 
   async readStreamChunk() {
     if (this.readStreamState.resolved) {
-      // This is normally impossible to reach. Has it been uploaded?
-      console.warn(`Chunk ${this.offset} already read. xhr initialized = ${this.xhr ? 1 : 0}`);
-      // We may want to retry (or not) to upload (but never try to read from the stream again or risk misordered chunks
-      return;
+      // Requiring to read the same chunk twice is unlikely but may happen (in case of retry a failed upload)
+      // If the bytes are still here (this.payload), then retry the upload...
+      if (this.payload && this.pendingRetry) {
+        console.info(`Retrying chunk ${this.offset} upload`);
+        return this.uploadStreamChunk(this.payload);
+      }
+
+      console.warn(`Chunk ${this.offset} already read. xhr initialized = ${this.xhr ? 1 : 0}. payload size = ${this.payload ? this.payload.size : null}. readState = ${this.readState}. retry = ${this.pendingRetry}`);
+      // ... but never try to read that same chunk from the (non-rewindable) stream again or we'd risk
+      // not only misordered chunks but a corrupted file.
+      return null;
     }
 
+    this.readState = 1;
     await this.readStreamGuard();
     var data, asyncRead = this.flowObj.opts.asyncReadFileFn;
 
@@ -326,8 +334,12 @@ export default class FlowChunk {
       this.readBytes = data.size || data.size === 0 ? data.size : -1;
     }
 
+    return this.uploadStreamChunk(data);
+  }
+
+  async uploadStreamChunk(data) {
     if (data && data.size > 0) {
-      if (this.flowObj.chunkSize) {
+      if (this.fileObj.chunkSize && data.size > this.fileObj.chunkSize) {
         // This may imply a miscalculation of the total chunk numbers.
         console.warn(`Chunk ${this.offset}: returned too much data. Got ${data.size}. Expected not more than ${this.flowObj.chunkSize}.`);
       }
@@ -377,7 +389,6 @@ export default class FlowChunk {
     }
 
     if (asyncRead) {
-      this.readState = 1;
       await this.readStreamChunk();
       return;
     }
diff --git a/test/asyncSpec.js b/test/asyncSpec.js
index 7f87679..e35b3da 100644
--- a/test/asyncSpec.js
+++ b/test/asyncSpec.js
@@ -12,52 +12,59 @@ describe('upload stream', function() {
 
   class Streamer {
     constructor(chunk_size) {
-      this._reader = null;
+      this._reader = {};
       this.chunk_size = chunk_size;
 
       // See the comment in read() for why we implement a custom reader here.
-      this.buffer = null;
-      this.index = 0;
+      this.buffer = {};
+      this.index = {};
     };
 
     init(flowObj) {
-      this._reader = flowObj.file.stream().getReader();
+      // ToDo: Use flowObj.uniqueIdentifier ?
+      this._reader[flowObj.name] = flowObj.file.stream().getReader();
+      this.buffer[flowObj.name] = null;
     };
 
     async read(flowObj, startByte, endByte, fileType, chunk) {
-      // chunk._log(`Start reading from ${this.buffer !== null ? 'existing' : 'the'} buffer`);
-      if (this.buffer === null) {
+      // console.log(`[asyncRead ${flowObj.name}#${chunk.offset}] start reading from ${this.buffer[flowObj.name] !== null ? 'existing' : 'the'} buffer`);
+      if (this.buffer[flowObj.name] === null) {
         // console.log(`[asyncRead ${chunk.offset}] no preexisting buffer => reader.read()`);
         /*
           Here we would expect a partial read of 64kb (by implementation) but it seems that
           *all* the buffer is returned making difficult to make a test based on ReadableStreamDefaultReader() behavior.
           As such we simulate it.
         */
-        const {value: buffer, done} = await this._reader.read();
-        this.buffer = buffer;
+        const {value: buffer, done} = await this._reader[flowObj.name].read();
+        this.buffer[flowObj.name] = buffer.slice(0);
 
         if (buffer) {
-          // console.log(`[asyncRead ${chunk.offset}] got a buffer of ${buffer.length} bytes...`);
+          // console.log(`[asyncRead ${flowObj.name}#${chunk.offset}] Read ${buffer.length} bytes`, buffer);
         } else {
           // console.log(`[asyncRead ${chunk.offset}] no buffer[bail]`);
           return null;
         }
       }
 
-      if (this.buffer.length === 0) {
-        // console.log(`[asyncRead ${chunk.offset}] this.buffer is null[bail]`);
+      if (this.buffer[flowObj.name].length === 0) {
+        // console.log(`[asyncRead ${chunk.offset}] this.buffer[${flowObj.name}] is null[bail]`);
         return null;
       }
 
-      // console.log(`[asyncRead ${chunk.offset}] Read slice[${this.index}:${this.index + this.chunk_size}] a buffer of ${this.buffer.length} bytes`);
-      var buffer_chunk = this.buffer.slice(this.index, this.index + this.chunk_size);
+      if (! this.index[flowObj.name]) {
+          this.index[flowObj.name] = 0;
+      }
+
+      // console.log(`[asyncRead ${chunk.offset}] Read slice[${this.index[flowObj.name]}:${this.index[flowObj.name] + this.chunk_size}] a buffer of ${this.buffer[flowObj.name].length} bytes`);
+      var buffer_chunk = this.buffer[flowObj.name].slice(this.index[flowObj.name], this.index[flowObj.name] + this.chunk_size);
+      // console.log(`[asyncRead] Read slice of ${buffer_chunk.length} bytes`);
 
       if (!buffer_chunk) {
         // console.log(`[asyncRead ${chunk.offset}] null slice`);
         // console.log(buffer_chunk);
       } else {
-        // chunk._log(`Read slice of ${buffer_chunk.length} bytes`);
-        this.index += this.chunk_size;
+        this.index[flowObj.name] += this.chunk_size;
+        // console.log(`[asyncRead] ${buffer_chunk}. index is now ${this.index[flowObj.name]}`);
         return new Blob([buffer_chunk], {type: 'application/octet-stream'});
       }
 
@@ -97,7 +104,7 @@ describe('upload stream', function() {
     xhr_server.restore();
   });
 
-  it('synchronous initFileFn and asyncReadFileFn', async function (done) {
+  it('synchronous initFileFn and asyncReadFileFn', function (done) {
     // No File.stream() support : No test
     // No support for skipping() test from Jasmine (https://github.com/jasmine/jasmine/issues/1709)
     if (typeof Blob === 'undefined' || Blob.prototype.stream !== 'function') {
@@ -120,16 +127,17 @@ describe('upload stream', function() {
     }
 
     var content = gen_file(chunk_num, chunk_size),
-        orig_hash = hex(await hash(content)),
         sample_file = new File([content], 'foobar.bin');
 
-    console.info(`Test File is ${chunk_num} bytes long (sha256: ${orig_hash}).`);
+    console.info(`Test File is ${chunk_num} bytes long.`);
     console.info(`Now uploads ${simultaneousUploads} simultaneous chunks of at most ${upload_chunk_size} bytes`);
 
     flow.on('file-error', jasmine.createSpy('error'));
     flow.on('file-success', jasmine.createSpy('success'));
-    flow.on('complete', () => {
-      validatePayload(done, content, {orig_hash, flow, requests: xhr_server.requests});
+    flow.on('complete', async () => {
+      validateStatus({flow, content_length: content.length, requests: xhr_server.requests}, flow.files[0]);
+      await validatePayload(content, {flow, requests: xhr_server.requests});
+      done();
     });
 
     var streamer = new Streamer(upload_chunk_size); // chunk_size);
@@ -201,4 +209,219 @@ describe('upload stream', function() {
     flow.addFile(sample_file);
     expect(console.warn).toHaveBeenCalled();
   });
+
+  it('async stream support request temporary failure', async function () {
+    // ToDo: This test use low-level files[0].chunks[x].send(); to do atomic
+    // uploads and avoid the unstoppable (recursive) loop.
+    xhr_server.configure({autoRespond: false, respondImmediately: false});
+
+    var streamer = new Streamer(1);
+    flow.opts.initFileFn = streamer.init.bind(streamer);
+    flow.opts.asyncReadFileFn = streamer.read.bind(streamer);
+
+    flow.opts.chunkSize = 1;
+    flow.opts.maxChunkRetries = 3;
+    flow.opts.simultaneousUploads = 2;
+    await flow.asyncAddFile(new File(['12'], `stream-failure-${jasmine.currentTest.id}.bin`));
+    var files = flow.files;
+    expect(files[0].chunks.length).toBe(2);
+
+    await files[0].chunks[0].send();
+    // xhr.error() is unusable. See https://github.com/sinonjs/nise/issues/148
+    // xhr_server.respond(xhr => xhr.error());
+    xhr_server.respond([400, {}, 'Error']);
+
+    xhr_server.respondWith([200, { "Content-Type": "text/plain" }, 'ok']);
+    await files[0].chunks[0].send();
+    await files[0].chunks[1].send();
+    xhr_server.respond();
+
+    validateStatus({flow, request_number: 3, requests: xhr_server.requests});
+    // See the above comment about why the (inconsistent state can't be tested)
+    // expect(flow.files[0].isUploading()).toBe(false);
+    // expect(flow.files[0].isComplete()).toBe(true);
+    await validatePayload(null, {
+      orig_hash: "6b51d431df5d7f141cbececcf79edf3dd861c3b4069f0b11661a3eefacbba918", // "12"
+      requests: xhr_server.requests,
+    });
+  });
+
+  it('Do not corrupt multiple streams', async function () {
+    xhr_server.configure({autoRespond: true, respondImmediately: true});
+    xhr_server.respondWith([200, { "Content-Type": "text/plain" }, 'ok']);
+    var streamer = new Streamer(1);
+    flow.opts.initFileFn = streamer.init.bind(streamer);
+    flow.opts.asyncReadFileFn = streamer.read.bind(streamer);
+
+    flow.opts.chunkSize = 1;
+    flow.opts.maxChunkRetries = 3;
+    flow.opts.simultaneousUploads = 2;
+    await flow.asyncAddFiles([
+      new File(['1234'], `multi1-${jasmine.currentTest.id}.bin`),
+      new File(['56789'], `multi2-${jasmine.currentTest.id}.bin`)
+    ]);
+
+    await flow.files[0].chunks[0].send();
+    await flow.files[1].chunks[0].send();
+    for (let i = 0; i < (9 - 2); i++) {
+      flow.uploadNextChunk(true);
+      await sleep(1);
+    }
+
+    for (let file of flow.files) {
+      expect(file.isUploading()).toBeFalsy();
+      expect(file.isComplete()).toBeTruthy();
+      expect(file.progress()).toBe(1);
+    }
+
+    expect(flow.progress()).toBe(1);
+    validateStatus({flow, request_number: 9, requests: xhr_server.requests});
+    await validatePayload(null, {
+      orig_hash: '03ac674216f3e15c761ee1a5e255f067953623c8b388b4459e13f978d7c846f4', // "1234"
+      requests: xhr_server.requests,
+      filter: x => x.requestBody.get('file').name === `multi1-${jasmine.currentTest.id}.bin`
+    });
+    await validatePayload(null, {
+      orig_hash: 'f76043a74ec33b6aefbb289050faf7aa8d482095477397e3e63345125d49f527', // "56789"
+      requests: xhr_server.requests,
+      filter: x => x.requestBody.get('file').name === `multi2-${jasmine.currentTest.id}.bin`
+    });
+  });
+
+  it('should pause and resume stream', async function () {
+    xhr_server.configure({autoRespond: false, respondImmediately: false});
+    var streamer = new Streamer(1);
+    flow.opts.initFileFn = streamer.init.bind(streamer);
+    flow.opts.asyncReadFileFn = streamer.read.bind(streamer);
+
+    flow.opts.chunkSize = 1;
+    flow.opts.maxChunkRetries = 3;
+    flow.opts.simultaneousUploads = 2;
+    await flow.asyncAddFiles([
+      new File(['123456'], `foobar1-${jasmine.currentTest.id}.bin`),
+      new File(['789'], `foobar2-${jasmine.currentTest.id}.bin`)
+    ]);
+
+    let files = flow.files;
+    let counter = {};
+
+    /*
+      [      ]
+      [   ]
+    */
+    expect(files[0].chunks.length).toBe(6);
+    expect(files[1].chunks.length).toBe(3);
+    flow.upload();
+    expect(files[0].isReading()).toBeTruthy();
+    await sleep(1);
+
+    /*
+      [^^    ]
+      [   ]
+    */
+    expect(xhr_server.requests.length).toBe(2);
+    expect(xhr_server.requests[0].aborted).toBeUndefined();
+    expect(xhr_server.requests[1].aborted).toBeUndefined();
+
+    // Reply to XHR n°1 and 2
+    xhr_server.respond();
+    /*
+      [oo    ]
+      [   ]
+    */
+    expect(xhr_server.requests[0].status).toBe(200);
+    expect(xhr_server.requests[1].status).toBe(200);
+    await sleep(1);
+    /*
+      [oo^^__]
+      [   ]
+    */
+    expect(xhr_server.requests.length).toBe(4);
+    expect(files[0].isUploading()).toBeTruthy();
+    expect(files[0].isReading()).toBeFalsy();
+
+    // Next two chunks from file[0] were read but we abort() their
+    // corresponding `xhr`. They will get back to pending.
+    // Flow should start uploading second file now
+    files[0].pause();
+    await sleep(1);
+
+    /*
+      [oo____]
+      [^^ ]
+    */
+    expect(xhr_server.requests[2].aborted).toBeTruthy();
+    expect(xhr_server.requests[3].aborted).toBeTruthy();
+    expect(xhr_server.requests[4].aborted).toBeUndefined();
+    expect(files[0].isUploading()).toBeFalsy();
+
+    flow.upload();
+    await sleep(1);
+    expect(files[0].isUploading()).toBeFalsy();
+    expect(files[1].isUploading()).toBeTruthy();
+
+    // Reply to XHR n°4 and 5
+    xhr_server.respond();
+
+    expect(xhr_server.requests.length).toBe(6);
+    expect(xhr_server.requests[4].aborted).toBeFalsy();
+    expect(xhr_server.requests[5].aborted).toBeFalsy();
+
+    /*
+      [oo____]
+      [ooR]
+    */
+    // Should resume file after second file chunks is uploaded
+    files[0].resume();
+    await sleep(1);
+
+    /*
+      [oo^^__]
+      [oo^]
+    */
+    // Finish file 1
+    expect(files[0].isUploading()).toBeTruthy();
+    expect(files[1].isUploading()).toBeTruthy();
+    expect(xhr_server.requests.length).toBe(9); // Above 7 + 2 failed when pause()
+    xhr_server.respond();
+
+    /*
+      [oooo__]
+      [ooo]
+    */
+    // Upload finished
+    expect(files[1].isUploading()).toBeFalsy();
+    expect(files[1].isComplete()).toBeTruthy();
+    expect(files[1].progress()).toBe(1);
+
+    /*
+      [oooo__]
+      [ooo]
+    */
+    // Finish file 0
+    await sleep(1);
+    expect(xhr_server.requests.length).toBe(11);
+    xhr_server.respond();
+
+    /*
+      [oooooo]
+      [ooo]
+    */
+    expect(files[0].isUploading()).toBeFalsy();
+    expect(files[0].isComplete()).toBeTruthy();
+    expect(files[0].progress()).toBe(1);
+    expect(flow.progress()).toBe(1);
+
+    validateStatus({flow, request_number: 11, requests: xhr_server.requests});
+    await validatePayload(null, {
+      orig_hash: '8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92', // "123456"
+      requests: xhr_server.requests,
+      filter: x => x.requestBody.get('file').name === `foobar1-${jasmine.currentTest.id}.bin`
+    });
+    await validatePayload(null, {
+      orig_hash: '35a9e381b1a27567549b5f8a6f783c167ebf809f1c4d6a9e367240484d8ce281', // "789"
+      requests: xhr_server.requests,
+      filter: x => x.requestBody.get('file').name === `foobar2-${jasmine.currentTest.id}.bin`
+    });
+  });
 });
diff --git a/test/helpers.js b/test/helpers.js
index 4b8d28c..df183b0 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -34,6 +34,29 @@ function uploadProgress(file) {
   return {readStates, chunkCount, completion};
 }
 
+/**
+ * Validate whether a generated file is successfully reconstructed from Flow XHR.
+ *
+ * @param args      Contains `flow` and either `content_length` or `request_number`
+ */
+function validateStatus(args, file) {
+  let {
+    requests: _requests = (typeof xhr_server !== 'undefined' ? xhr_server.requests : null),
+    flow: _flow = (typeof flow !== 'undefined' ? flow : null)
+  } = args;
+
+  if (!_flow && !args.request_number) {
+    console.warn("Called validateStatus with no flow instance");
+  }
+  var predicted_request_number = args.request_number || Math.ceil(args.content_length / _flow.opts.chunkSize);
+  expect(_requests.length).toBe(predicted_request_number);
+  if (file) {
+    expect(file.progress()).toBe(1);
+    expect(file.isUploading()).toBe(false);
+    expect(file.isComplete()).toBe(true);
+  }
+}
+
 /**
  * Validate whether a generated file is successfully reconstructed from Flow XHR.
  *
@@ -41,34 +64,24 @@ function uploadProgress(file) {
  * @param content   File original content.
  * @param orig_hash (Optional) File original hash. if not provided, it will be computed from content.
  */
-async function validatePayload(done, content, args) {
+async function validatePayload(content, args) {
   let {
     orig_hash = null,
     requests: _requests = (typeof xhr_server !== 'undefined' ? xhr_server.requests : null),
-    flow: _flow = (typeof flow !== 'undefined' ? flow : null)
+    filter = x => true
   } = args;
 
-  if (!_flow || !_requests) {
-    console.warn("Called validatePayload with no array requests");
-    done();
+  if (!_requests) {
+    console.warn("Called validatePayload with no requests array");
+    return;
   }
 
-  var predicted_request_number = Math.ceil(content.length / _flow.opts.chunkSize);
-  expect(_requests.length).toBe(predicted_request_number);
-  var file = _flow.files[0];
-  expect(file.progress()).toBe(1);
-  expect(file.isUploading()).toBe(false);
-  expect(file.isComplete()).toBe(true);
-
   // An array of promises of obtaining the corresponding request's body (= payload)
-  var payload_contents = _requests.map(x => x.requestBody.get('file').text());
+  var payload_contents = _requests.map(x => [200, 201].includes(x.status) && filter(x) ? x.requestBody.get('file').text() : '');
   orig_hash = orig_hash || hex(await hash(content));
-  Promise.all(payload_contents)
-    .then(values => hash(values.join('')))
-    .then(hash => hex(hash))
-    .then(hexhash => {
-      // console.log(orig_hash, hexhash);
-      expect(hexhash).toBe(orig_hash);
-      done();
-    });
+  console.info(`Test File sha256: ${orig_hash}.`);
+  let values = await Promise.all(payload_contents);
+  let hexhash = hex(await hash(values.join('')));
+  // console.log(orig_hash, hexhash);
+  expect(hexhash).toBe(orig_hash);
 }
diff --git a/test/uploadSpec.js b/test/uploadSpec.js
index b6a6927..54a4af2 100644
--- a/test/uploadSpec.js
+++ b/test/uploadSpec.js
@@ -580,7 +580,7 @@ describe('upload file', function() {
     expect(xhr.requests.length).toBe(6);
   });
 
-  it('should allow to hook initFileFn function', function(done) {
+  it('should allow to hook initFileFn function', function() {
     var content = gen_file(6, 128),
         sample_file = new File([content], `foobar-initFileFn.bin`),
         customFunction = jasmine.createSpy('fn'),
@@ -595,7 +595,8 @@ describe('upload file', function() {
     expect(customFunction).toHaveBeenCalledTimes(1);
 
     flow.on('complete', async () => {
-      await validatePayload(done, content, {requests: xhr.requests, flow});
+      validateStatus({flow, content_length: content.length, requests: xhr.requests}, flow.files[0]);
+      await validatePayload(content, {requests: xhr.requests});
     });
 
     xhr.respondWith('ok');