xamarin.forms mashup to test image picker + downsample using open source packages...
Xam.Plugin.Media - for picking image (https://github.com/jamesmontemagno/Xamarin.Plugins/tree/master/Media) FFImageLoading - for resizing image (https://github.com/molinch/FFImageLoading/wiki/Xamarin.Forms-Advanced)
... quick sample project to figure which nuget packages to use to abstrack image picker, image croping and image resizing ... iOS is workong
ToDo • Android • tidy up code