So, I tested and works with both gifs in the description and screenshots, my question is why? Using devtools you can see that the gif file was indeed uploaded, but it refuses to show it in the page, just the first frame instead. It's annoying, I'm starting to making assets to sell in the platform and I can't show properly my animations without the gifs working, I know itch's team is small, but this issue is taking too long to fix...
(Before you ask, I'm not a English native speaker :D)