I think you need to set up a Publisher set for BIMx files and populate it with a view of the model and any drawings you want to include.
If there is a BIMx publisher set, check it to make sure you have at least one 3D view included.
Think Like a Spec Writer
AC4.55 through 28 / USA AC27-6010 USA
Rhino 8 Mac
MacOS 15.2