[Solved] Can't import mesh help me pls!

**I use a translator.
I'm sorry for the unnatural sentence.


I am making a cc by extracting 3D MESH of other games from SFM.
I'm not going to distribute it, and it's for personal use. But if it's a problem, I'll delete it.


Some items have been successfully moved, but some items are not imported by S4Studio.



Import mesh does not change and remains the original file.



As I searched, this problem usually comes from not setting GEOM properly. I certainly did the GEOM setting up exactly.
Other files are successful, and only this file is not recognized.


I think it's because there are too many polygons. So I tried to reduce the polygon.
But reducing the polygon didn't solve the problem.

Despite all the attempts, S4Studio does not recognize the mesh.




Searching for more than eight hours won't solve the problem. be obliged to leave a note I'm sorry.
I'll attach the file, so I'd really appreciate your advice!!


*Note: I was working in the "hat" category.