[Ricksby]

I created a backup .msb file on my Sony tablet (Android 5.1.1) from MobileSheetsPro 2.9.6 and transferred it to my Samsung Galaxy (Android 13).

MobileSheetsPro_2023_11_24.msb (437Mb)

Trying to restore it to MobileSheetsPro 3.8.21 on the Galaxy I get the message:
"..selected file is not a valid MobileSheets backup file" 

I have repeated this in different ways, transfers and with and without audio - same result.

Help please