Update the underlying PDF preserving notes.
It would be a great feature having the ability to update the underlying PDF (which was previously imported) with an updated version.
Thinking about how Papyrus works, I hope this will be a great and feasible idea to implement.
I personally use this great app at University and here lecture slides are quite often updated in order to correct mistakes or to add some contents. If I do not want to loose my notes, I have to stuck with the first version.