[Zubersoft]

There isn't an option for managing files yourself in the Windows 10 version because the OS doesn't let UWP applications access files outside of their application data directory unless the user provided direct access. That's why you have to set the storage location to the folder containing all of your files (or a parent directory of that directory), so that MobileSheets has access to the files. When a batch import occurs on files inside the storage location, MobileSheets will recognize this and will not try to move/copy them, and will instead use them from their original location. This is basically the equivalent of managing your own files in the Android version with the caveat that any new files that are imported from outside the storage location will be copied into the storage location. Having said that, if you pick an entire hard drive as the storage location, then MobileSheets will never try to copy any files and will have access to every folder on that hard drive, so this is one way of handling it.