Curious if there's a solution to this issue as I too have the same situation. I've exported a .usdz from KeyShot 10, then imported into Reality Composer for Mac OS/Desktop. I can see my model in Reality Composer on Desktop but when I export the project and/or scene and open in Reality Composer on iOS/iPhone, the model does not appear. I also tried exporting from KeyShot as a .usdz with the option to export as a compressed GLB/GLFT using Draco. All exports were at 50dpi, 16 samples, and preferred geometry node checked. Any ideas on how to resolve this are welcome.