On version 1.3.3, when adding an image to a comment without any existing text, the app crashes. If text is placed in the comment field, image being added will upload successfully with no crash.
Version 2.0 isn't out yet, but we've got beta versions available in the pinned post here. nocturne is correct - we don't plan to release any more updates to the v1 version of the app unless Lemmy makes breaking changes to the API before v2 is ready.