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You have to use either Chrome OS or the Crome browser to use Drive offline. It requires a few steps to set up, and then you will be good to go.
Here are the instructions from Google:
"From drive.google.com in your Chrome browser, click More on the left-hand side of the screen.
Click the blue button that says Get the app to go to the Chrome web store.
Click Add to Chrome in the upper-right corner of the browser window.
Once the app is installed, you'll be taken to a Chrome page with the Google Drive app icon. To return to Drive, click the Google Drive icon.
On the right side of the dialog on the Offline Docs page, click the blue button that says Enable Offline. At this point, it also works to click on the gear icon in the top-right corner of your main Drive view and select Enable Offline to set up offline access."