If you can create notes on the phone you’re doing better than I am with Nextcloud. I’ve never been able to get anything I made on the phone to sync, i can edit and it will sync TO the phone but for whatever reason it doesn’t work the other way with new files. I have a workaround of having a standing “scratch” note that I copy stuff out of when i’m back at home but it’s an extra annoyance i’d rather not deal with.