For some reason, I can’t paste here. Not sure if it’s me or the forums??
check my post history. Lists of threads about it. It’s an indexing bug. Either broken or intentional. Either way, it’s a dumpster fire in it’s current state compared to 12.4.1, which instantly indexes attachments, shows Live Photo’s, gifs and the like.
Go to your main messages view and search. If you see a notice about something something more available after indexing, your indexing isn’t done. Your attachments will show up after that message is gone. May take a few hours up to and beyond 20+ hours depending on how much you have.
iOS 13 doesn’t show Live Photo’s. It’s marked as such but won’t play them. Even if you save them. However if you go back to your message view and scroll to it, it’s fine. It’s terrible.