For me,
Absolutely number 1: have a preview of the notes’ content in the search results. It would be a complete game changer as most competitors have this. The lack of it makes it really hard to find something when there sre a lot of results. Full document search and with context shown in the search field
Number 2: when I write a url like http://whatever and finish with a space I’d love it to get converted into a hyperlink
Number 3: have the ability to unlink from a collection in the Android app