Connect Google Drive for Offline Viewing
Overview
Google Drive is a very powerful clould based storage service similar to Dropbox and Box. You can use it among various devices and it allows you to access the files for offline viewing as well.
Step 1 - Download from App Store
See below If you don't have it you may download it from the App Store.
Step 2 - Connecting the iOS device
see below
Step 3 - Enjoy your Google Drive
see below
Enjoy this video to explore further