I am working with a linked model; I've been told to copy all the walls and floors (in addition to levels and grids) into my local file to maximize screen performance, as it is painfully slow when information has to go back and forth to the central file on the server whenever I pan, change views, etc. I went to tools/copy-monitor, set my options, chose copy, made a rectangle around everything in the link (lower right to upper left), and nothing seemed to happen, but I clicked okay after waiting a bit. Then I tried to unload the link as I was instructed by the client's BIM specialist, and all the model geometry was gone. Any ideas on what is going wrong here?