Messages takes up multiple GB of storage, but "Top Conversations" are only 217.5 MB
My iCloud is largely filled up by Messages, which takes up 4.2 GB of my account. I definitely don't have that much Messages data, even including attachments, and if I tap on Messages in the Manage Storage page it does in fact show my top conversations only take up 217.5 MB.
Where are the other 4 GB coming from?
Other tangentially related gripe: the "iPhone failed to backup" and "iCloud out of storage" notifications are wayyyy too aggressive. I get them multiple times a day, the show up as badges on my Settings app, in my notification drawer, as toast messages while I'm using my phone...they're very intrusive and I don't want to just turn off notifications from all Settings.
iPhone X, iOS 13