Sometimes pages need to live across Multiple files. Instead of duplicating the pages and creating a new instance of it, it would be good to have one single source of truth. 

The intended result is to have one page that is in-sync across different files. If it gets updated in file 2, those updates should appear in file 1, and vice versa.

Alternatively, just being able to embed a read-only version of the page would be helpful. It could be editable only in the one (parent) file, but is visible in the other.