diff --git a/src/phoenix/fslib.js b/src/phoenix/fslib.js
index 1e7b674bde..3669069b90 100644
--- a/src/phoenix/fslib.js
+++ b/src/phoenix/fslib.js
@@ -123,6 +123,12 @@ const fileSystemLib = {
         }
         return filerShell.rm(path, { recursive: true }, cb);
     },
+    copyFile: function (src, dst, callback) {
+        if(Mounts.isMountSubPath(src) && Mounts.isMountSubPath(dst)) {
+            return NativeFS.copyFile(src, dst, callback);
+        }
+        throw new Errors.ENOSYS('Phoenix fs copy on filer or across filer and native not yet supported');
+    },
     showSaveDialog: function () {
         throw new Errors.ENOSYS('Phoenix fs showSaveDialog function not yet supported.');
     },
diff --git a/src/phoenix/fslib_mounts.js b/src/phoenix/fslib_mounts.js
index 4853dd8905..97af5bda60 100644
--- a/src/phoenix/fslib_mounts.js
+++ b/src/phoenix/fslib_mounts.js
@@ -271,6 +271,18 @@ function getHandleFromPath(normalisedPath, callback) {
     });
 }
 
+async function getHandleFromPathIfPresent(normalisedPath) {
+    return new Promise(resolve => {
+        getHandleFromPath(normalisedPath, (err, handle) =>{
+            if(err) {
+                resolve(null);
+            } else {
+                resolve(handle);
+            }
+        });
+    });
+}
+
 function getMountPoints() {
     return MountPointsStore.getMountPoints();
 }
@@ -287,7 +299,8 @@ const Mounts = {
     isMountSubPath,
     getHandleFromPath,
     getMountPoints,
-    refreshMountPoints
+    refreshMountPoints,
+    getHandleFromPathIfPresent
 };
 
 export default Mounts;
diff --git a/src/phoenix/fslib_native.js b/src/phoenix/fslib_native.js
index e0ce3c6c54..882ad17530 100644
--- a/src/phoenix/fslib_native.js
+++ b/src/phoenix/fslib_native.js
@@ -216,6 +216,54 @@ async function unlink(path, callback) {
     });
 }
 
+async function _getDestinationFileHandle(dst, srcFileName) {
+    return new Promise(async (resolve, reject) => {
+        dst = window.path.normalize(dst);
+        let dirPath= window.path.dirname(dst);
+        let dstFileName= window.path.basename(dst);
+        let dstHandle = await Mounts.getHandleFromPathIfPresent(dst);
+        let dstParentHandle = await Mounts.getHandleFromPathIfPresent(dirPath);
+        if (dstHandle && dstHandle.kind === Constants.KIND_FILE) {
+            reject(new Errors.EEXIST(`Copy file destination already exists: ${dst}`));
+        } else if (dstHandle && dstHandle.kind === Constants.KIND_DIRECTORY) {
+            const fileHandle = await dstHandle.getFileHandle(srcFileName, {create: true});
+            resolve(fileHandle);
+        } else if (!dstHandle && dstParentHandle && dstParentHandle.kind === Constants.KIND_DIRECTORY) {
+            const fileHandle = await dstParentHandle.getFileHandle(dstFileName, {create: true});
+            resolve(fileHandle);
+        } else {
+            reject(new Errors.ENOENT(`Copy destination doesnt exist: ${dst}`));
+        }
+    });
+}
+
+async function _copyFile(srcFileHandle, dst, srcFileName, callback) {
+    try {
+        let dstHandle = await _getDestinationFileHandle(dst, srcFileName);
+        const srcFile = await srcFileHandle.getFile();
+        const srcStream = await srcFile.stream();
+        const writable = await dstHandle.createWritable();
+        await srcStream.pipeTo(writable);
+        callback();
+    } catch (e) {
+        callback(e);
+    }
+}
+
+async function copyFile(src, dst, callback) {
+    let srcFile = window.path.normalize(src);
+    let srcFileName= window.path.basename(srcFile);
+    Mounts.getHandleFromPath(srcFile, async (err, srcHandle) => {
+        if(err){
+            callback(err);
+        } else if (srcHandle.kind === Constants.KIND_DIRECTORY) {
+            callback(new Errors.EISDIR(`Copy file cannot copy directory: ${srcFile}`));
+        } else {
+            _copyFile(srcHandle, dst, srcFileName, callback);
+        }
+    });
+}
+
 function mountNativeFolder(...args) {
     Mounts.mountNativeFolder(...args);
 }
@@ -232,7 +280,8 @@ const NativeFS = {
     stat,
     readFile,
     writeFile,
-    unlink
+    unlink,
+    copyFile
 };
 
 export default NativeFS;
diff --git a/test/SpecRunner.html b/test/SpecRunner.html
index d2c659c675..17c3c6d394 100644
--- a/test/SpecRunner.html
+++ b/test/SpecRunner.html
@@ -36,8 +36,11 @@
   </script>
 
   <!-- Import the phoenix browser virtual file system -->
+  <script src="../src/thirdparty/idb/idb-min.js"></script>
   <script src="../src/thirdparty/filer/filer.min.js"></script>
+  <script src="../src/thirdparty/Buffer/buffer-min.js"></script>
   <script src="../src/phoenix/shell.js" type="module"></script>
+  <script src="../src/phoenix/nohost_server.js" type="module"></script>
 
   <script src="thirdparty/jasmine-core/jasmine.js"></script>
   <!-- Pre-load third party scripts that cannot be async loaded. -->