How convert mmd *folder* into vrm ?

[YukiMemories]

So, I have downloaded a mmd and it was a folder with the textures, a pmx file and a tga one.
I tried to follow the tuto on the Wakaru website to import mmd, but the character became just... nothingness, so it's unusable.

I think it's because when i try to convert it on unity I got an error like "not enought bones to humanoid animations" or something like that.
I tried to configure the bones to points but my options where only like all the body or arms+legs+hair+eyes altogether...

So, any of y'all know how to convert the mmd folder into a single vrm file ? Or tell me if the Wakaru's tuto got a mistake in it ?
I would really apreciate it...

[YukiMemories]

It seems like it was just that one mmd that was crappy