Work on Google Docs Offline

Before you turn on offline access

• You must be connected to the internet.
• You must use the Google Chrome or Microsoft Edge browser.
• Don’t use private browsing.
• Install and turn on Google Docs Offline Chrome extension.
• Make sure you have enough available space on your device to save your files.

How to turn on offline access

1. Open Google Drive.
2. At the top right, click Settings   Settings.
3. Turn on Offline setting. 
   1. If you are using Microsoft Edge, you will be redirected to the Chrome Web Store to download the Google Docs Offline extension.
4. To work offline, open Google Docs, Sheets, or Slides. 

Tip:

• You can turn on offline access from Docs, Sheets, or Slides settings. If you turn on offline access for Docs, Sheets, Slides, or Drive, then the rest will also be available offline.
• Alternatively, to turn on offline access, open any Google document, spreadsheet, or presentation. At the top, next to the file title, click See document status   Turn on  Turn on.
• If you want to use offline access for another Google Account, make sure you’re signed in to the right Chrome or Edge profile. Learn how to switch Chrome profiles.

Source: https://support.google.com/docs/answer/6388102?hl=en&co=GENIE.Platform%3DDesktop