learn how). That was great, but it didn't typically sync your all of your older files. Soon that will change as Google has announced an update to Google Drive that will allow you to specify which files you want to sync for offline access. To do this you will simply open a file's overflow menu (that little three dot icon to the far right of your file) and toggle the "available online" switch.
This feature will roll out over the next few days. The feature is only available if you are using the Chrome web browser. Users in a Google Apps for Education domain will also need to make sure that their domain administrators have enabled offline access for Google Drive.
Learn more about using Google Apps for Education in my online course (graduate credit available) or at the Practical Ed Tech Chromebook Camp.