This is, I am sure, just a no brainer!
But I looked quickly for an answer...
You're in Lr and send a photo to edit in PS4x do the thing. Then I want to send the new version back into Lr. What I'd like is it to be there, continuing as a non destructive, undoable edit, of the very same file. Settle for a fast way to get it right back in the flow with the new edited file.
Want to be hit "Done-Return to Lr" and that's it.
How?