OpenRA

i somehow am unable to add custom / modded maps to my game
its the newest release of 20250330
i even created folder for it

does anybody know how do i make it work or someone willing to help in other way

You could donwload ISO file from some abadonware site, mount it, open Openra and use Manage content. It will automaticlly donwload all files.
Gruntmod should also work, but I never use that, so I dont know how it works.