[itsme]

I click Import - Local File
I select the file
I click Open
The dialog Import Settings is displayed with "Guess Title From Filename" and "Ignore Duplicate Files", all groups are empty
I click OK
Sometimes the window "Importing file" is shown for a few seconds
MobileSheets closes without any further message

I have sent a mail with a link to a folder in my GoogleDrive with a video and hopefully helpful data