Something I really miss in the mobile app are buttons for things like bold and italic text, creating lists and headers like the desktop version has. Because there required symbols for this like # [ ] etc are not as accessible on a mobile keyboard, it is actually very hard to create good notes on the mobile app.
Adding a checkbox for example is “- [ ] text”. Also, once you made one, an enter press does not create a new checkbox on the next line like the desktop version does.