Share Email Facebook Twitter LinkedIn To Reference a Project Drawing from the Cloud Note: You must use this method if the drawing file contains Plant 3D objects. Click Collaborate tabPlant Collaboration panelAttach. In the Attach External Reference dialog box, Attach (check box) column, select the drawing. Click Attach. Parent topic: About Accessing Autodesk Collaboration for AutoCAD Plant 3D Related Concepts About Accessing Autodesk Collaboration for AutoCAD Plant 3D Related Reference Collaborate Tab Reference