The Synchronize with Central process loads changes from other files to the central file, and then saves local changes to the central file, which are saved by default.
In a Revit session, you use Collaborate tabSynchronize panelSynchronize with Central to start saving changes.
The Central File Access pane of Worksharing Monitor displays the progress of the Synchronize with Central operation, which involves several distinct steps. These steps are tracked in the Step/Time Remaining column.
A Synchronize with Central operation involves the following steps:
If the Step/Time Remaining column displays Waiting, the Synchronize with Central operation is on hold because it is blocked by other concurrent actions involving central file access. See About Delays When Using Synchronize with Central.