[Harry_M]

If you long press a song on the library screen, there is an option to "Swap PDF". Is this different than what you are looking for? I would think this would be faster than having to go through the song editor to do it.

Yes, that's fine for me if I know that the song already exists in the database.
Most of the time, I am not sure if it already exists. In these cases I start mobilesheets via click on the pdf. Now I would like to have the duplicate supervision that looks if the song already is in the database. It can add it normally if not, but should prompt for "swap pdf" if it exists to avoid duplicates.
I think this would simply be the batch import duplicate detection, but also for single imports.