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How do I utilize multiple UV sets from (maya FBX to ue4)

I have much experience in MAYA but relatively new to UE4.

I have not been able to find anything that can help with my problem.

I understand UE4 likes seperate ‘UV sets’ INSTEAD of multiple tiles in UV’s spaced as such (0,1) (1,0) (1,1).

  I Have my mesh imported to UE4 and my base material (substance material in this case).

  I have a separate PNG file to apply a texture to ONE of the UV sets, but I am confused on how to apply to one set and not all.

Last thumbnail below shows a texture coordinate node set to (1) Im guessing this means the 2nd UV set? (starting the count from 0)
and blending the texture to the diffuse/basecolor, but when applied, the texture is spread across all UVs.

any help or link to video series/tutorials is much appreciated!