What is the key difference between linking a CAD file and importing it into Revit?

The key difference between linking a CAD file and importing it into Revit lies in how those actions affect the connection between the original file and the Revit project. When a CAD file is linked, Revit creates a reference to the original file, allowing for any updates made to that file to be automatically reflected within the Revit project. This dynamic relationship means that if changes are made to the CAD file externally, those changes will appear in Revit after a simple refresh, ensuring that the Revit model remains current and accurate with respect to the most recent data in the CAD file.

On the other hand, importing a CAD file essentially brings a static version of that file into Revit. Once the file is imported, it is no longer connected to the original and any subsequent modifications made to the CAD file will not be updated in the Revit model. This can lead to discrepancies if the external CAD file is altered, as those changes will not be recognized in the Revit environment.

This understanding highlights the benefits of using linked CAD files for projects that may evolve or require regular updates, as opposed to imported CAD files, which serve as a fixed reference.