Whenever you open a project that is linked to a file, Revit retrieves the current saved version of the linked file. The path to the linked file displays in the Saved Path column of the Manage Links dialog.
If Revit cannot locate the linked file, it displays the path to the version of the linked file that it retrieved most recently. Revit is not able to update the link. To reload the linked file from a different location, use the Reload From function of the Manage Links dialog.
Use the Path Type column to indicate whether the path is absolute or relative. In general, use a relative path instead of an absolute path.