[Markismus]

@zenji What? I have really dug into the notes before I upgraded the Note Pro from Android 6 to Android 9. I have even wrote a script to convert the exported text-notes to LaTex. However, I _never_ encountered disappearing Notes. I was able to to check a box that generates a pdf-file from my note-file everytime it closes. I was able to export all notes to pdf-file manually. I was able to back them up to local file storage and to the Onyx Cloud. I was able to disconnect from the Cloud after upgrading without a loss of notes.

However, I was not interested in the database file that keeps all my lines and regenerates my notes. Nor did I try to copy and use it to regenerate my own notes. Could it be that your database file was damaged?

EDIT: I did encounter a temporary loss of access to notes when I upgraded my version 3.1 Android 6 firmware to version 3.0 Android 9 firmware. However, this was resolved after upgrading to version 3.1 Android 9. Could this be your reason for disappearing?

EDIT2: I do strongly feel for you for the loss of notes. Even if turns out to be temporary. It's hours of work that are lost or missing. Rather devastating.