If you import your files from within the storage location, then the folder structure will be maintained and you can manage your own files/folders. Batch importing from inside the storage location absolutely works, but Microsoft's file browser (which I'm required to use for local file selection) will only show folders when the user is selecting folders. It won't show both files and folders when prompting the user to select a folder. So that's not a bug - it's just how Microsoft chose to implement their folder selection dialog. Go ahead and select a folder for the batch import from within the storage location and you will see that it imports all the files and they won't be moved.
You cannot rename files outside MobileSheets without breaking the link to those files and I don't currently have a rename option in the app itself (I will add that at some point). If you want to rename a file, you can go ahead and do so, then go to the song, long press or right click it to select it, tap the three dots at the top right then Swap File, and select the renamed file. That should update the database to point to the new file name.
Mike
You cannot rename files outside MobileSheets without breaking the link to those files and I don't currently have a rename option in the app itself (I will add that at some point). If you want to rename a file, you can go ahead and do so, then go to the song, long press or right click it to select it, tap the three dots at the top right then Swap File, and select the renamed file. That should update the database to point to the new file name.
Mike