To expand on @jmikesell's answer, I don't think there is a way to get PBR (Physically Based Rendering) materials into Vuforia Studio. I have found that you can get regular diffuse textures into Studio by setting up your textures on your model in your favorite 3D modeling software, exporting the model out as an .obj, and compressing your files into a .zip. I believe you need to zip up your texture files, the .mtl file from the .obj file export, and the .obj before uploading it the Resources of your Vuforia Studio. You should be able to bring in the model and see the textures on your model. They won't be photorealistic but at least they can have some of the details that you would expect from your textures.
In my experience, the .obj would not show all the textures correctly and the model had some smoothing group and polygon normal issues that were not present in 3DS Max. I'm going to try to reduce the amount of textures the model uses down to one and fit all the UVs for the model in a single 0 - 1 UV space to see if this fixes the issue. I have not been able to find any official documentation on getting textured models into Vuforia Studio so most of this knowledge is from forum posts and trial and error. Good luck on getting the realistic look into your project! I'll update this post if I'm able to get a working version of the textured .obj in Studio.
