USD texture mismatch
How to connect the textures to the USD models properly? Some files have a material mdl file, some don't. Files without it the USD materials don't match the filenames or the materials so there is no way to properly hook them up
It would help to know what application you're trying to use these in as you shouldn't have to hook up any textures manually.
The dataset includes two USD files for each asset. In each folder, you should see two USDs (both named the same, and one with a "_physics.usd" suffix). That should be the file you use for UsdPhysics simulations. The other is a plain source USD file without any physics data applied so that it can be configured for other engines that can consume USD files. Any custom MDLs that were applied will be stored within the /materials subfolder for those assets, but many assets simply use the baseline OmniPBR.MDL file that is a part of an Omniverse application and should work directly.
If you've found an asset that does not follow this pattern, please let us know.