Resumable uploads do not work with Safari nor ios

[jjchiw]

Hi!

I had an error with the flag resumeChunkSize trying to upload from safari and ios devices, the extra fields (_chunkSize, _currentChunkSize,_chunkNumber and _totalSize) didn't were added to the formData.

So I did a little debugging and read the code and I found this

this.isResumeSupported = function () {
    return window.Blob && (window.Blob instanceof Function) && window.Blob.prototype.slice;
  };

It seems that in Safari and in ios window.Blob is not an instance of Function so the flag resumeSupported was false.

I changed the code to:

this.isResumeSupported = function () {
    return window.Blob && (window.Blob instanceof Object) && window.Blob.prototype.slice;
  };

And its working, do you think it's an acceptable change? or do you think it has other consequences that I'm not seeing. I tested in Windows (Firefox, Chrome Edge) OSX (Safari, ios simulator safari, chrome)

[danialfarid]

It should be fine for the purpose of uploading but other Upload.xxx functions may not work properly specially like urlToBlob.

[danialfarid]

Fixed at 12.0.3

[jjchiw]

Thanks!