Loss of connection not being handled/trapped

[Phil-G]

When uploading a file, if the network connection is lost, the upload fails but file.error is only set to true and therefore

outputs the word true.

Also data.context in fileuploadfail points to .template-upload, not .template-download so no error can be displayed manually.

[blueimp]

Acknowledged.

With modern browsers, it's actually possible to automatically retry the uploads as documented here:
https://github.com/blueimp/jQuery-File-Upload/wiki/Chunked-file-uploads#resuming-file-uploads