Sorry if this is known/obvious issue but my google-fu is failing me! I've downloaded from Package Manager version 1.0.3 of USD, using URP version 7.5.1 in Unity 2019.4.14f1. When I export a prefab out from Unity it's only exporting the model, not the textures. I believe this is because USD expects separate maps for metallic and roughness, whereas the URP shader requires the roughness map to be packed into the alpha of the metallic, and as such the textures don't export. Can anyone confirm if this is correct, and if so how I can go about exporting USD out of URP? Hope this is clear but let me know if I can add more details.