Can't seem to replace class-specific textures in camos/skins, and blank files

[MikillRosen]

While using the feature to replace camos, I notice I can't seem to replace class-specific textures.
An example is the OldSchool (free) DLC skins. The camo has a unique texture for each class. If I modify the Old School camo, all classes use the same texture.
While I may not know Chinese and I'm only using Google Translate, the guide doesn't seem to say anything about this situation, so I don't know what I'm doing wrong.

What I also don't see is the ability to modify a gender's texture. It seems I can't modify a texture separately for male and female.

I don't know if you already know this, but when I modify a camo, the mod loader seemingly tries to replace all files related to the camo. If I don't have sufficient files, then the missing ones become blank, like the icon (if I don't have a file for it).

[zerodegress]

Sadly, because Justin switch the framework to IL2CPP, it seems too difficult to scrutinize how to fix this, Unless if the Mono comes back one day.
P.S. And on top of that, the developer's operation of the game is really disappointing to me and gives me little incentive to keep updating the project.