Samsung Notes not opening copyrighted files

In preparation for Alevel mocks, I've downloaded a few past papers to practice on, and I usually use my tablet for all my college work, but Samsung Notes wont let me edit the file, only view it, which is incredibly annoying, especially as these papers were released for students to use.

I could use word or other note taking apps but Samsung Notes is a lot bettter and its easier to keep everything in one place.

I was wondering if there are any ways to get past this copyright restriction? Thanks