Adding Road to Google photorealistic 3D Tiles

Hello. Using Cesium for unreal engine plugin in Unreal Engine, I went to a specific coordinates and now I want to add a road in this location. In normal situation, in a Basic level in Unreal Engine I can easily add road to my landscape, but when I want to add road in Google photorealistic 3d Tiles with Unreal engine, the road is invisible (as it has shown in the following image). What’s the problem? what should I do? (I have highlighted the road with a blue circle in following image).

Can you walk us through how you’re adding the road?