I can't play modded zombies on steam, and i don't know why.  Only one mod shows called "Frontlines" and i don't even know what it is. I can play modded maps if I launch them from the map manager, but I want it to show on the steam WAW app.

Also, I can't create a profile when I'm on the steam version of WAW. If you can, answer this please.

FOUND IT on my own thank you very much. it was installing the mods on a different user/profile on my PC