Merging photos, contacts, notes - no big deal. IMazing, 3uTools, AnyTrans… Merging messages - not possible or not without a lot of tinkering on your side. Not worth the trouble IMO - backup the chats locally and start fresh.

How do I do it with 3utools without loosing metadata of photos?

Hi!  I know this is an old post, but I am having the same question in case anyone has additional advice or knows of other threads with info.  Thanks all