Texturing imported FBX Terrain

Hi guys
I am completely new here, and probably my question sounds stupid but can some of you give me some direction how to put different textures (more than 6) onto imported FBX Terrain from Civil 3D?
I know that I can blend 3 materials and painting the surface with them, but I need a bit more… I already tried to convert my custom Terrain to Heightmap with Blender but the accuracy was very poor
Thanks!!!

check in blender/maya that it has good uv mapping
you can’t really terrain paint onto an fbx, that’s only for landscape meshes which are a different thing.
You would be better to paint it in substance or something like that.

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Thanks for the answer!
Do you know how to convert my 3D Terrain to Heightmap with really good accuracy in Blender, Maya or Max,so I can use it like Landscape in Unreal? Or probably some video tutorial…