You can convert most GIF files to webp, which lemmy can use, and those are MUCH more efficient in terms of quality for the space used. But for some reason if you try to upload a GIF to lemmy it turns it into an MP4 file, instead. It’s generally much better to convert to webp first, or better yet create in that format to begin with.

That fixed it for me, too! Thanks!

At some point a couple days ago, I stopped being able to update icons or banners on communities. I’ve tried everything I can think of on my side, including appointing a friend as a mod, who was also unable to edit the images.

[EDIT] I had both English and Undetermined selected somehow, and as per user suggestion I fixed that, and it worked! I can now update images, I just had to select ONLY undetermined.

Those are actually not GIF files, they are *.webp files. I’m not sure if GIF format is supported, honestly.