Would be for interest, where the shared data/folders are stored on the Android-system/SDcard.
I searched a long time, but could not find them. Seems some Android-applications (Samsung Galaxy) do have the same problems, as any changes are not saved, even the message poped up "Gespeichert", but after reopening these simple text-files, it will NOT show my changes. "DB Text-Editor" and "Polaris Office" are these kind of applications which are not able to store changes out of the TeamDrive-application.
Greetings D. Schoch