Xamarin.Forms Shared在Android视图中不显示图像，但在iOS视图中显示图像

我正在Xamarin共享应用程序中创建欢迎屏幕。欢迎屏幕必须显示图像几秒钟，然后导航到登录页面。它在IOS中完美运行，但在Android中不显示图像。

 public Page()
    {


        //var beachImage = new Image { Aspect = Aspect.AspectFit };
        //beachImage.Source = ImageSource.FromFile("nextera.png");
        Image logo = new Image { WidthRequest = 800, HeightRequest = 800 };
        logo.Source = ImageSource.FromFile("nextera.png");
        logo.Aspect = Aspect.AspectFit;
        Content = new StackLayout
        {
            Children = { logo },
            Padding = new Thickness(0, 20, 0, 0),
            VerticalOptions = LayoutOptions.StartAndExpand,
            HorizontalOptions = LayoutOptions.CenterAndExpand

        };
        WaitAndExecute(2000);

    }

    private async Task WaitAndExecute(int milisec)
    {
        await Task.Delay(milisec);
        await Navigation.PushAsync(new Login());
    }