We could do what I think you’ve done, and regex the details of the attachment into ! [] ()

To be clear, this pull request doesn't use regex, it's just JSON deserialisation and string interpolation.

I’ve never actually seen a Mastodon user try to add an image to something that ended up as a Lemmy comment, tbh, so it’s not something I’ve thought too much about.

The pull request actually includes one, the main KDE account tags !kde@lemmy.kde.social and includes pictures in their threads regularly. It's just hard to tell from our side as you can't see what's missing.