Hi all, I do a lot of work with PDF textbooks. I'd like to be able to add a comment next to problems/exercises (as in, a sticky note that collapses and is unobtrusive) which is handwritten, so I can include diagrams and such. Every app I've come across only offers drawing directly on the page, or typed text-only comments. I don't have a device in mind; I'm just wondering if something like this exists at all on Android. Any suggestions? Thanks!