Yes, I read the FAQ about textures and stuff, and I dont think it fully applies to this.

Ok, so like, I bought all 4 trail textures, and I had someone make the textures for me. I uploaded them, and they show up in my custom folder, but I cant see them ingame.

yes, I have the trails, you can check my inventory. The textures are in rgb and have colour on them.
I can see trails of other people also, and the person who made me the trails (cindermomo) was able to equip them onto himself to send me a picture of it.

so yea, I am not sure what is wrong here.