iPhone unable to complete data transfer

I have same problem as well. iPhone 8 to 11 using wireless. It says the connection was lost but phones are next to each other and both unlocked.

I still have the same problem. Tried dozens of times. But it never works!!!

Resolved mine as well. My issue was different. It updated iOS on new phone to 13.1.3 as part of install. My old phone was still on old version. I updated old phone to new version and it worked first time.

I was cussing and swearing Apple words for a while there lastnight as had tried 5 times which was a big time waster.