It would be great to be able to work together on a notebook, document or memo. This makes it easier in school and university to write down the content of a group work, because everyone can work on the document. So once everyone can participate and secondly, afterwards everyone has the document, so you don't have to upload it somewhere else to share.
Anna Rhodes commented
Would be helpful for students in lectures, or other group / collaborative efforts.
animations man commented
You should make it possible to share documents so you can work on both the computer and mobile