Google Drive makes editing a document easier because everyone can share files and work together - in real time. But in Drive, it’s tough to track all the changes to your shared files. So effective immediately, you’ll notice a new activity stream in Drive – a single, easy-to-view place to review every action taken on your files and folders.
When you open Google Drive, click the ⓘ button in the top right corner and the activity stream will appear, showing you who has taken action on files and folders in My Drive. You’ll see a rundown of all the edits and comments, moving and removing, renaming, uploading, and sharing and unsharing.
Google has also made it easier to see who owns a file, who it's shared with, and who can edit it by hovering your cursor over the image icons in the top right corner next to the new activity stream icon.
For more information, visit Track Activity of Files.