Tilemapservice can't display the texture when connect the local server

I Add cesium3dtileset actor and set the local URL ,then i add component cesiumtilemapservicerasteroverlay and set URL,but didn’t display the texture, thus in cesiumJS ,it is normal

i step into the cesium3dtileset.CPP ,find prepareinloadthread method return nullptr.
is it the reason cause the problem?

the terrain data is tileset.rar download from
Tileset.zip (15.8 KB)

Hi @flyasdfg

We currently don’t support drape raster overlay on an arbitrary tileset asset. This feature only works with quantized-mesh

Thank you for your reply, What are the common tools for converting terrain into quantized-mesh and converting image into TMS? I use the cesiumLab ,but failed