by Ernie » Tue Sep 27, 2011 2:59 am
Do you mean organize decks in folders? If so, you can create a folder by tapping + (at main deck screen) then New Folder. It will ask which decks you want in the folder. To edit a folder, tap Edit, then the folder.
If this is not what you mean, can you be more specific? A file to me means something like a .txt file on a computer, so I'm a little confused. Sorry.
Another way to group cards in a single deck is to add a category to each card. This is just used to filter cards when studying.