The MvvmCross framework (I'm using version 5.6.3) strongly encourages all cross-platform logic to be put in the .Core (aka .NET Library) project, not the .Droid project.
VS 2017 will not install SignaturePad 2.3.0 into the .Core project:
Package Xamarin.Controls.SignaturePad 2.3.0 is not compatible with netstandard1.6 (.NETStandard,Version=v1.6)
What concept am I missing?
Is SignaturePad inherently "unfriendly" to MvvmCross?
Must I put all logic related to the signature (button clicks, etc) in the .Droid and .iOS projects?