I believe this has happened since updating my iPad Air to os9. A look at settings shows everything set up correctly, but I don't get the auto fill option across the top of the keyboard any more.
I can't remove pictures since quite some time ago.
When I notice that I've uploaded the wrong image, but didn't post yet, I go to Tapatalk and start writing and uploading pictures again.
Otherwise I delete the post with the wrong image and write it again (not very often), or I leave it at that.