Synchronizing a data reference brings in any changes made to its source object.
When a drawing contains references to data shortcuts, the  icon is displayed at the bottom-right side of the window:
 icon is displayed at the bottom-right side of the window: 
Data references are synchronized automatically when the drawing is opened. Otherwise, flags appear in the Prospector tree and the status bar of the drawing window when a reference object is out of date.

When references become out of date with the data shortcuts, the  icon displays a message prompting you to synchronize the references. Additionally, in the Prospector tree, the
 icon displays a message prompting you to synchronize the references. Additionally, in the Prospector tree, the  icon is displayed next to reference objects that need to be synchronized.
 icon is displayed next to reference objects that need to be synchronized.