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by the way, my mobile phone can run your demobuilds correctly
When I change some code in GPUInstancerConstants.cs
like this: from #elif !UNITY_EDITOR && UNITY_ANDROID to #elif UNITY_ANDROID
or you should provide some video for how to build for android/ios?
Create empty project with unity 2018.2.7f1, import GPUInstance.package.
then I switch project to android,set graphics api to vulkan for both pc...