No Materials?

Hi there!

I am trying to deploy a test project from Unreal to Quest.
I am able to run the application - but when I do so, all objects appear just black.

Well… the two spheres below do have a Substance Source Material assigned.
I can see them inside the UE4 Editor - but after sending it to the Oculus Quest - the Substance Materials are just grey.

I am using Substance Source Materials.

  • Is this not supported?
  • What am I missing here?

thank you so much for any little help,
appreciate it!