I have created a Revit topo model from an Acad Civil 3D as a separate file so that I can link it into my building model. I split the topo into two surfaces: site and surrounding streets. I left the site unshaded, but gave the streets a material I called "asphalt pavement". In the topo file, it looks correct, but when I link it into my building file, the gray shading of the asphalt disappears and the difference between street and site is difficult to make out. I have fiddled with the link settings for a couple hours now and nothing seems to bring back my shades of gray.
What controls the material of a topo when it becomes a linked file?
topo file alone:
topo file linked into building: