Hi again,
ok, as I thought. Yes that's something I'm currently fixing. Archive should of course not try to load old / unavailable pictures. An in addition you should be able to get rid of them. A new version is in progress but it still needs some more testing before I upload it here on itch.io.
What's quite funny is, that you are by far not the first person who copies the pictures into Archives folder. And that's the only location where they're shouldn't be in. Because the programm can't handle this. ;) I really have to fix this or prevent it from happen.