importing USD from maya

Hi,
I am trying to import a scene from Maya 2022 into Clarisse 5 using USD but I have 2 problems.
1- My project structure doesn't caring over, every objects are ungrouped.
2- There is no shaders (aiStandardSurface) or textures that come along with USD.
Am I missing something?
Thanks
I am trying to import a scene from Maya 2022 into Clarisse 5 using USD but I have 2 problems.
1- My project structure doesn't caring over, every objects are ungrouped.
2- There is no shaders (aiStandardSurface) or textures that come along with USD.
Am I missing something?
Thanks