Question GLTF import has black splotchy shading

Hello all, I have been trying and failing to get .gltf models to render properly on my Android application. I imported the model using Siccity's GLTFUtility. The shading appears to be off, there are black splotches across almost the entire model (both in the Unity editor and when building to an Android device):



The only component of this model I'm able to edit in the Unity editor is the shader, and I've tried changing several fields to no avail. Additionally, I've noticed that whenever the current platform of the editor is set to Windows 64-bit, the model displays completely correctly. But as soon as the platform is changed back to Android, the model appears incorrectly again. Any help would be greatly appreciated.