Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics
(3 edits) (+2)

I have the same issue.
I tested with both PNG and JPG and neither of them works (both on my asset page and here in the forum when I just tried to add a screenshot of it). The ZIP-file uploads normally thought.

Browser is Firefox 114.0.1 (64bit, Linux) in case that might be relavant.

Edit: It works now. :)