Can't Publish to the Workshop

Hi everyone, I keep receiving this message when trying to upload my mod, which is a few simple custom facepaints. I've tried multiple times to publish, but it always freezes when it gets to the "EltemUpdateStatusInvalid" part of it. In my Steam Workshop page, it produces a basic "XCOM 2" mod, but lacks a description or any sort of pictures.

What might be going on here, and what can I do to fix it? I've tried re-building and producing a new ID (deleting the other publication ID file), and I'm at a bit of a loss here. :/

EDIT: I found out what the problem was. My mod preview was a .png file rather than a .jpg, which screwed up the upload. It still gives me the same message, but it actually uploaded to the Workshop.