Today, Google has updated Google Docs, Slides, and Sheets to make opening files easier on your iOS and Android devices when you are not online.
Google will now automatically sync and save files that you have recently worked on to your mobile device. If your device is running out of offline storage space, all of Google’s apps will automatically remove the oldest files from your phone or tablet so you can regain storage space.
In the slide-out menu users will now see a new ‘Offline’ tab, where all your documents that are saved to the device are located. This tab will show documents that are both automatically and manually synced. Just to note, if your document has a checkmark, that means it was manually synced.