When I use Datasmith in Rhino, some parts are always missing.

Development World Creation
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1

I want to proceed with rendering work in Unreal Engine, but some of my work files are still not being imported.
The missing files are surfaces, but some surfaces are missing, not all surfaces.
In the file in Unreal Engine, the name for Static Mesh appears, but there is no Static Mesh itself.

I had this situation before, so I was a bit reluctant to learn Unreal, but this time, when version 5.1 came out, I tried to start learning, but some files are missing again.
Any way to solve this?

2

Are you exporting udatasmith file out of rhino?
Which Rhino version?
Do you have the latest datasmith exporter for rhino?
Can you share your Rhino file with us?