When users edit the data of a container, they can audit previous changes (see what changes have been made and by whom), track changes, and see a historical view of changes. How to do this is described in the section System Use | Audits and Change Tracking,
This feature is automatic implemented, and system administrators do not need to explicitly switch it on. A system administrator can, however, add images and files to the change tracking system. The setting for this is in the Image Settings of the app.