Hammer++ not loading custom textures

[atomic obsidian]

Hi everyone!
So I'm trying to load custom textures into hammer++ using Garry's mod and I used this guide but it doesn't seem to work: https://gamebanana.com/tuts/15620
No matter where I put the custom folder (I tried putting it into garrysmod, my source sdk instance, and even in GarrysMod\sourceengine), hammer++ just doesn't want to load my textures. Why?

Here are my mounts incase it's something of note:

{
"cstrike"    "D:\SteamLibrary\steamapps\common\Counter-Strike Source\cstrike"
"left4dead2"    "C:\Program Files (x86)\Steam\steamapps\common\Left 4 Dead 2\left4dead2"
"left4dead2_dlc1"    "C:\Program Files (x86)\Steam\steamapps\common\Left 4 Dead 2\left4dead2_dlc1"
"left4dead2_dlc2"    "C:\Program Files (x86)\Steam\steamapps\common\Left 4 Dead 2\left4dead2_dlc2"
"left4dead2_dlc3"    "C:\Program Files (x86)\Steam\steamapps\common\Left 4 Dead 2\left4dead2_dlc3"
"episodic"    "D:\SteamLibrary\steamapps\common\Half-Life 2\episodic"
"ep2"    "D:\SteamLibrary\steamapps\common\Half-Life 2\ep2"
"tf"    "C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf"

}```

[atomic obsidian]

Hammer++ not loading custom textures

[atomic obsidian]

I figured it out, incase anyone needs this in the future, you put your custom materials into: D:\SteamLibrary\steamapps\common\GarrysMod\bin\win64\hammerplusplus\materials