I have 4 apple devices linked to my iMessage account. There's lot of clutter and junk messages (confirmation codes, appointment reminders, etc) and I just want to reserve iMessage for my messages friends/family. I can easily delete these junk messages, but it's not syncing across all devices. I thought somewhere Apple announced they would be syncing iMessage? It's a new macOS feature? or iOS? I'm hazy on where I read it would appreciate some clarification. Thanks.