I’ll have to check that actually. Maybe I can give her a high-capacity iOS device and let her sign into that, and then delete everything from there.

Is every video considered a large attachment?

Pulled it up on my phone just to see what they considered "large", looks like 4MB is the cutoff (nothing smaller than that shows up for me). But nearly everything I'm seeing is a video or a photo taken with my real (not phone) camera. And a random PDF I apparently sent over iMessages.

However, deleting through this interface would be a pain. You select "Edit" and then each attachment is selected individually.

It seems to just show you the largest set (50? 100?). If you delete them, then you will eventually show smaller ones once you get through enough of them.

Really wish there was a "delete all" or "select all".

Thanks. That makes sense. But I didn’t feel like deleting anything. Just my wife and I on the iCloud storage and there’s plenty of it at present. My photo collection that I’ve been cleaning up is a bigger offender right now than messages. Damn cats doing cute things.