When I create a new aiStandard Surface in Hypershade and input all of my Substance-exported textures and apply it to my mesh, the shader looks nothing like it does in Substance. I just end up with a dark gray surface with a tiny bit of reflectivity. And I don't mean it looks different because of the lighting. I mean NONE of the texture properties such as the scratches or specularity come through.
I've tried setting up the shader manually (see nodes screenshot) and using the Substance plugin for Maya. Both yield the same results. I believe I'm using the correct colorspace settings as well as checking 'Alpha is Luminence' for all grayscale maps. I've watched and followed every tutorial I can find on Substance -> Maya and they all make it look effortless but for some reason Maya refuses to display the textures for me.
Note: I've used only unedited smart materials from Substance for this example. I used the Arnold output template in Substance. Arnold Render View screenshot is circled in red with the part of the mesh which has the aiStandardSurface with Substance texture maps applied.
If anyone has any ideas, I'd really appreciate it. I'm completely stuck on this.