Unfortunately, the Version of Godot used by the Kiosk does not support importing certain kinds of jpeg and gif images that fit certain criteria. Double unfortunately, jpeg and gifs provided as game covers by itch meet these criteria. Until this sort of issue is resolved, it is necessary to convert and upload a game's cover image as png somewhere else. For example, in a random thread on the Community Kiosk's itch page. This is said thread. You can inspect the related github-issue here.
