That worked! Thank you for the quick fix/workaround. Will disable on my live instance for now too.

If I'm understanding what you're asking, you just have to add pdf in the Allowed File Extensions.

Admin > Settings > Uploads > Allowed File Extensions

I discovered this possibly a month ago when I attempted to add a pdf to a file and received an error. Thought I remembered a settings and found it after checking other spots...didn't notice Upload right away. Lol. Anyway hope that helps.