To get the details on the current and previous versions of the selected file, along with details on who performed the update, when it was updated and the file size for each version, select versions in the Context menu or or right-click on the file and select Versions from the menu.
Each time a file is added, re-uploaded, edited, deleted, or restored, a new version of the file is created. The time-format of the file versions is <mon dd, yyyy>, hh:mm AM/PM>. You can open and view any version of a file and revert to any of the older versions.