How do you know when something has gone wrong?
Sync problems are rare, but they do occur and sometimes a file cannot be uploaded from the Google Drive folder on the computer to your online Drive storage space. Just drag one or more files or folders to the Google Drive folder and the app will upload them in the background to keep online and offline copies in sync. It saves having to up and download files through the browser. The Google Drive app can be installed on a Windows PC or Apple Mac and this creates a folder on the local disk drive that is a mirror image of your online storage space.