LumenRT Problems

Hi,

I have two questions about LumenRT

1. When exporting from DGN to LumenRT, content is missing like trees and bushes (sse images).
2. is it possible to combine LumenRT models, or update form MicroStation? So in one model I have all the trees, peoples and cars and in another the DGN model.

The reason I ask for this is When I have to change my Civil model (DGN file)  I have to replace all the content I placed in an earlier stage and it would be great to reuse these content. 

Regards, Christiaan