If I had to guess, I’d say lemmy.ml is overloaded and to try again. I think I uploaded an image a few days ago via Jerboa but I’ve been testing different clients and it’s possible I used Liftoff which is another popular android client you could try to see if it behaves differently.

Also, this is the wrong sub for support questions. See rule 2 in the sidebar.

This could be a question for !jerboa@lemmy.ml - if you’re looking for general support, please check the sidebar for suggestions.