MIMETYPE: Failed

[Guest]

Hey, I had a similar issue. Does the error give you a MIMETYPE that is causing the issue? I know for me, it said that Zip files were needed while I was trying to upload PPTX files. So while not elegant, my solution was just to add the zip file-type to the approved list and everything works now.

Anyway, not sure if that answers your question, but that helped me.