Kobo licensed tech from MyScript who make the Nebo note taking app on Windows, iOS and Android. See
https://www.nebo.app/. They also use the ".nebo" extension and you can manually import notebooks into the apps that you maybe backed up on Dropbox or whatever so I'm curious if the Kobo ".nebo" notebooks are compatible with the apps and are notebooks from the apps compatible with the Elipsa?
I can send you a test notebook if you need one and are curious.