How to import layered textures

I have a terrain in maya with a layered texture consisting of two UV maps, however when i import the file into unity, only one is applied to the shader.

i have had single models with 2 completely different textures in maya imported into unity (mostly) fine as separate shaders, but it doesn't seem to be working with layered textures.

p.s. i am sorry if this has been posted before, but everytime i try to search the forums, unity3d.com gives me a 504 gateway timeout error