ok so I have a custom skybox extracted from my friends map (his HDD crashed) but it is 6 sides, how do i apply this, sorry if this is stupid question.
Skybox files belong under “…\materials\skybox”. Check a .vmt for proper placement.
Map / Map Properties / Skybox Texture Name
The name of the skybox is the .vmt file path starting under “…\materials\skybox” and ending at the directional suffix.
This might help: 2D skybox