Hair Mesh Don't Import on Sims 4 Studio

Hi! This is my first time trying to transform a mesh hair, it's a CC, not a base game mesh but I want to make some changes on the mesh for my personal use. I read that a sim hair has three hat chops/cuts, but precisely two of them correspond to the meshes I want to delete. When I deleted those UV maps, the three cuts remained but I got the error in S4S that the UV maps were missing and that's why I deleted those two cuts to eliminate that error as I read in other answers on the forum.

That's why I think that is the reason why it's not imported correctly in the Sims 4 Studio because it's not changing the previous mesh. Precisely I want to delete the lower part of the hair, I'll leave here the blender files, both the original and the modified mesh in case you can help me, pls. I don't know how to fix this to import correctly. Thank you very much! <3

Here is the link to the Blender files