Mobile offline sync is a lost cause. The dev environment, even on Android, is so hostile you’ll never get a good experience.

Joplin comes close, but it’s still extremely unreliable and I’ve had many dropped notes. It also takes hours to sync a large corpus.

I wrote my own web app using Axum and flask that I use. Check out dokuwiki as well.

From memory MTP is pretty flaky and quite slow.

ADB push is pretty good but at that stage rsync is just as easy.

Put SSH in the phone and you can do it all from the computer too.