A Microsoft framework for building cross-platform mobile apps using .NET and C# with native performance and user interfaces.
It looks like maybe you are uploading the debug package and not a release build that has the linker turned on to "link sdk assemblies". See: https://learn.microsoft.com/en-us/xamarin/android/deploy-test/release-prep/?tabs=windows and I even have a video: https://www.youtube.com/watch?v=7kVeC1_14Ag