* if "note box" doesn't appear fully on screen: hit the little grey "RESET DIMENSIONS" button (@ bottom left of note box!) to make the "note box" fully visible on screen again!

* when you have a bunch of notes in there and the "note box" starts to take up more height: it "seems" as if you can NOT see/get to the SAVE button at the bottom...

BUT, SOLUTION: you can actually remedy/solve that by simply clicking in the notes again!
(Not 100% intuitive at this point, admittedly.)

Then the keyboard appears - and you can just SCROLL UP the page and then see the SAVE button again - and hence successfully save what you just wrote. :)