Set up iCloud Drive
If you didn’t set up iCloud Drive when you installed iOS 9, you can set it up in Settings. iCloud Drive is an upgrade to Documents & Data. When you upgrade to iCloud Drive, your documents are copied to iCloud Drive and become available on your devices using iCloud Drive. You won’t be able to access the documents stored in iCloud Drive on your other devices until they are also upgraded to iOS 8 or later, or OS X Yosemite or later. For more information about upgrading to iCloud Drive, see support.apple.com/HT201104.
Set up iCloud Drive. Go to Settings > iCloud > iCloud Drive, turn on iCloud Drive, then follow the onscreen instructions.
Show iCloud Drive on your Home screen. Go to Settings > iCloud > iCloud Drive, then turn on Show on Home Screen.