Google Drive is used to backup photos, videos, files and important document to cloud to access them from anywhere on any device with an internet connection. But what if you don't have an internet connection. Thankfully, Google Drive has a "Offline feature which allows you to view and edit Drive, Docs, Sheets, and Slides files when you're not connected to the Internet.
From the Desktop:
If you want to activate the Offline setting on your computer or Mac, then you will need to download and install "Google Drive" app on your computer. Now enter email address and password to sign in to your Google Drive account. Once you sign in to your account, the app will automatically begin syncing your available files to the desktop. If any of that have been brought in from the cloud, then it will immediately be available for full local access and offline use. If you don't want to sync your entire library at once, then you can alter which files are saved. To do so, click "Google Drive" taskbar icon and select "Preferences" option from the menu. You will see 2 options i.e. "Everything in My Drive", or "Only These Folders". Choose "Only These Folders" option and scroll through to either enable or disable any files or folders you want attached to your current desktop.
From Your Mobile Device:
To acivate the Offline setting on your mobile device, open "Google Drive' app and find the file which file or folder you want to sync offline. Google Drive allows you to sync documents or spreadsheets for offline use. It is helpful to save space and prevent a phone from going into download overload. Once you have selected the file you want to work on, tap "3 vertical dots" located next to the file and select "Keep Offline" option from the submenu.