Contrary to the others here,while I love Paperless,using it for textbooks and notes only worked “somewhat” for me - it becomes quite clunky after a while.

Personally I would rather go with Calibre if I were you if you have more textbooks than notes. Even for notes, they can be attached as well and better organised than Paperless.

(And don’t get me wrong paperless is awesome and I use it heavily)