I was reminded of this issue today, in this thread: https://discursive.adamprocter.co.uk/2025/06/06/oh-good-grief-microblog-didnt.html
Essentially the app can sometimes look like everything worked with the photo upload, but it didn't actually upload. Then you go to post and you end up with a text-only blog post, no photos.
Just FYI @vincentritter, I wanted to document this here so we can address in the next bug fix update.