When added a USDZ file to the three.js editor it loads into the scene and I can see the gizmo to control it but I can not see it and there is no materials tab connected to it.
Do you mind sharing the problematic USDZ asset in this topic?
Of course!
Though I have tried many I will share one from sketchfab.
Thank you!
Air_Jordan_1_usdz.usdz (7.0 MB)
That file appears to have USDC scene while three.js only supports USDA.
You can at least view it with the online USDZ Viewer.