Lots of instances are temporarily halting image uploads due to csam attacks against Lemmy. I’m not sure if this is what’s happening in your case, but it may be something to check on
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Oh, yeah, that's right. I read that Lemmy.World has turned off pics temporarily, due to the CSAM thing going on with one of their communities:
(There's an update that says that the community has been shut down)
I had an issue like this a while ago, but it ended up being a size limit thing with my instance - can you try uploading something smaller? If it doesn't work with something smaller, you know it's not that. Just a thought. It could def be the app, but this is an easy way for more info.
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Just had this happen to me. It was an image I had uploaded before. Didn't think anything of it.