After attaching a reference the graphics are either not displaying correctly or not displaying at all.
In V8 there can be multiple Models in a file. Each Model is its own container of elements. It is very easy to attach a reference and choose the wrong Model. Here are the steps to attach a particular Model as an attachment:1. File > Reference > Tools > Attach.2. Choose the file you would like to Attach and select OK.3. In the Attach Reference Settings dialog box go to the Model pull-down and select the Model to attach to the active file.