Beta Issue - Queuing additional files to an already in progress upload will cause all pending files to fail

[iCanHazSkillz]

Issue:
Queuing additional files to an already in progress upload will cause all pending files to fail transfer with the error 'File type is not allowed'

Expected behavior:
The upload queue should be able to grow dynamically without having to wait until the current transfer is complete.

Steps to replicate:
-Upload a subset of file to a chosen playlist.
-Queue additional files during the upload operation.
-This will trigger the 'File type is not allowed' error on all queued files that haven't uploaded already.

Workaround:
Wait until current upload finishes before adding any additional files.