StartActivityForResult equivilant Xamarin Forms

I'm setting up a dependency service to pick a MediaFile in Xamarin.Forms

        var intents = new Intent (Intent.ActionGetContent);
        intents.SetType ("video/*");
        intents.SetAction (Intent.ActionGetContent);
        Forms.Context.StartActivity(Intent.CreateChooser(intents, "Choose Video"));

my Intent starts fine and ends by how do I retrieve the file URI at the end? Been trying several things including XLabs but thats not working right now under the Unified API. Any help would be greatly appreciated