Based on the provided tileset, the main reason for the tileset not being rendered is that it contains point cloud data, and this is not yet supported.
This is indicated by a warning in the console:
… [warning] [TileContentFactory.cpp:74] No loader registered for tile with content type ‘’ and magic value ‘pnts’.
Admittedly, the message could be clearer: For end-users, it should just say: “Point clouds are not supported”, and it should probably be an error message, and not only a warning. Also, I could/should have guessed that based on the directory screenshots that you posted, which clearly contained a
The support for point cloud rendering is currently being worked on. This is part of the pull request at Add point cloud rendering (support glTF POINTS geometry) by nithinp7 · Pull Request #627 · CesiumGS/cesium-unreal · GitHub (cc @Nithin_Pranesh ), and will probably be part of one of the next releases.
An aside: There is another problem, with the B3DM part of that tileset, which I haven’t analyzed in all depth, but based on the symptoms/error message, is almost certainly related to Replace glTF enum properties with primitives (int/string), and provide a class with known enum values · Issue #258 · CesiumGS/cesium-native · GitHub - I hope that this will also be addressed soon.