The Live documents tile shows you an overview of the recent edited documents from the account you are logged in with. This gives users the option to open the file with the Online or Local Office Apps as well as opening the file location. At the bottom you can also open the Documents app.
To activate the app:
1. As an admin, go to apps management
2. Activate the Live Documents tile
3. Add this app to a shared group & click done and make visibile to the users.