[Zubersoft]

When you selected the SD card icon in the file browser, what options did you see there? Did the USB drive not show up as an option in the list? If it does show up in the list, is the problem that you can't create the backup file (meaning you run into an error), or is the problem just that you can't navigate to the USB drive to select a folder to use? Did other app utilize Google's file picker? This is the same thing that is shown if you use Import->System File Browser on the main library screen of MobileSheetsPro. If so, they are relying on Google's framework to select the file, and Google has access to things in the OS that aren't exposed to applications. In order to support their file picker for creating the backup file, I would have to change a fair amount of code. This is something I plan on supporting, I just haven't had time to implement the necessary changes yet. The backup file will also be much slower to create this way as it has to go through Google's storage access framework, so if your library is several gigabytes in size, be prepared to wait for a while.

Mike