I am playing Trackmania: Nations Forever on steam, but my system is Arch Linux. And I cant find anywhere to put my custom maps. Where are they stored?
Welcome to the arqade!
While I don't know how TMNF installs on Linux, I can give you some hints as to how to find the location. I wanted to post this as a comment at first for that reason, but it would have been hard to read.
On Windows, downloaded maps for TMNF are put in this dir:
By that logic, you could look if
Create a map using the map editor and save it. It needn't be any good, it just has to have a name. Then, search for it using something like
find ~/ -name "<trackname>.Challenge.Gbx"
You might have to fiddle with capitalisation; if all fails, start the search at
/ and search for
Created maps are stored near the place you'd put your downloaded maps, i.e.
.../TmForever/Tracks/Challenges/ My Challenges/<trackname>.Challenge.Gbx Downloaded/<PLACE TRACKS HERE>