!Friendica Support

Apologies for the fundamental question, but I can't seem to find what I'm looking for online.

I'm trying to help test the new Fedilab app, and one error I've been having is that I'm unable to upload photos from the app. The developer said that my instance does not return supported MIME types. An update was provided that prevented it from crashing from not detecting the MIME type, but the draft window just closes, so I'd like to try to fix it on my server.

Is there a way to fix this on my server easily, and where is the MIME type file located? Which mime types should I enable?

Thanks!