For best effect, and to update the original file, you need to sync from it, not a copy.

The communication between Revit or Archicad is done using a KEY (GUID) that we create in the model.

Therefore, it is important not to use a copy of the design model and synchronize with BIMEYE. Then the GUID is written into it and next time you get an updated model there is no GUID to match the ones in BIMEYE. Because a new KEY on GUID is created…