No idea? Animated GIFs have been broken for going on three weeks now and there still isn’t at least a working theory why that you can share with us? 😭
There are two long topics about this, including one that Leaf has posted in [1] [2]. A lot of us rely on animated GIFs for our page presentation, and the lack of updates about what’s going on are really frustrating and disempowering.
I have all my animated GIFs in the body text hosted in GitHub repos and linked via HTML, but banners and background images have to be uploaded to Itch via the theme editor on the project page, so those depend on your image hosting to be rendered correctly.