Importing 3D dgn elements, specifically stenciled striping onto 3D surfaces, to ConceptStation and export to LumenRT?

I am importing 3D dgn elements to ConceptStation, and then exporting to LumenRT for photo/video editing and rendering. In my dgn/3D model, I am stenciling the striping onto the 3D surfaces/models and then importing the dgns to ConceptStation. They show up ok in ConceptStation, but when exporting to LumenRT, the striping elements do not show up or seem to export.