Apparently there was an update that forced a new format and won't let me open existing notes unless I install "Samsung Notes add-on", but when I try to do so it "does not allow unknown updates from this source". Google Play Store thinks I have latest update and lists no such "add-on".
Solved! Go to Solution.
I'm having the same issue. I go to setting to allow the add on to be installed - and I don't have the option. Now I can't access any of my very important notes and can't get any help. I just want to see my notes so I can copy them into Google and start using that. Because this is just stupid.