In any other program importing materials will assign automatically the textures but here the materials and some textures are imported but not connected to the the object except the diffuse. Other textures are lost. Also colors are not transferred. I really would appreciate a response of the developers about this. It can be quite time consuming assigning them again in Lens studio.
Also I suppose also that is a question of set a default format for material imports. Most of people would prefer PBR but FBX doesn't support that format. But we should be able to set a default of PBR and the imported material automatically converted to PBR. Currently it creates a non PBR material that if it were properly connected to the object also would be problematic as we would be forced to delete it and create a new PBR.