https://discussions.unity.com/t/substance-materials-appear-full-black-on-android/40008
Substance materials appear full black on Android - Questions & Answers - Unity Discussions
Apr 9, 2012 - For some reason, my substance materials (default sample ones) appear full black on Android, even with generate on load checkboxed. Is there something else that...
substance materialsfull blackon androidquestions answersappear
https://experienceleague.adobe.com/en/docs/substance-3d-designer/using/working-with-3d-scenes/overriding-scene-materials
Overriding scene materials | Adobe Substance 3D Designer
Override existing materials in 3D scenes to replace them with your own Substance materials for testing and preview.
adobe substanceoverridingscenematerialsdesigner