SITUATION:
hey all, i found these great, free, legal, textures on the web and i want to use them in my map. ive figured out how to access them in gtk and apply them to a brush, but some of them cause sompiling trounble, some of them show up (while in the game) as the grey default texture. few of them show up. they are all .jpg files and i know that the size is not an issue because i used a much larger texture and it worked while the smaller one did not.

QUESTIONS:
1)what is going on?
2)how do i fix it?
3)how do i make my textures work?

NOTE:
thanks for all your help guys, u have no idea how much you have participated in helping me make my map. :)

PK3 them. The game only reads files in PK3's, unless you set \sv_pure to 0.