Hi everyone,
Currently we have support for Tile Map Service (TMS) and Bing Maps. To add support for WMTS requires adding a new RasterOverlay-derived class in cesium-native (See cesium-native/RasterOverlay.h at main · CesiumGS/cesium-native · GitHub) plus a very simple ActorComponent for it in Cesium for Unreal.
We’d love to see a pull request from the community for this if anyone is keen!
Kevin