I think it would be nice to be able to add an expandable, hand-written note. Currently the only option for in-document notes uses the keyboard for input. Being able to add a written, expandable note would allow you to add equations or quick drawings/graphs to the document while still preserving the margin space and clean look of the original document.
Dear Dr. Dwelle,
You can use the drawings tool to handwrite some notes in PaperShip.
Julien Therier, Ph.D.
We’ve improved the freehand drawing annotations in the latest update (v3.3). Feel free to try it again to see if this is more convenient to write small text, for instance.