I've tested your sample and it works file. The content of EmbeddedContent.txt file could be read successfully. Please test the code on your side.

var assembly = typeof(EmbeddedResourceProject.Class1).GetTypeInfo().Assembly;
//var assembly = IntrospectionExtensions.GetTypeInfo(typeof(EmbeddedResourceProject.Class1)).Assembly;

Stream stream = assembly.GetManifestResourceStream("EmbeddedResourceProject.EmbeddedContent.txt");

string content;
using (var reader = new System.IO.StreamReader(stream))
{
    content = reader.ReadToEnd();
}

Console.WriteLine("==Content:"+content);

Related tutorial:
https://docs.microsoft.com/en-us/xamarin/xamarin-forms/data-cloud/data/files?tabs=windows#loading-files-embedded-as-resources

There is a method RightViewRect used to define the location of RightView , but you should create a subclass to override it .

Code

[assembly: ExportRenderer(typeof(TimePicker), typeof(MyRenderer))]
namespace App2.iOS
{
    class MyRenderer : TimePickerRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<TimePicker> e)
        {
            base.OnElementChanged(e);

            if (this.Control != null && this.Element != null )
            {
                var downarrow = UIImage.FromBundle("icon.png");

                UIGraphics.BeginImageContext(new CGSize(20,20));
                downarrow.Draw(new CGRect(0, 0, 20, 20));
                var resultImage = UIGraphics.GetImageFromCurrentImageContext();
                UIGraphics.EndImageContext();

                Control.RightViewMode = UITextFieldViewMode.Always;
                Control.RightView = new UIImageView(resultImage);
            }
        }

        protected override UITextField CreateNativeControl()
        {
            return new MyTimePicker();
        }
    }

    class MyTimePicker : UITextField
    {
        public override CGRect RightViewRect(CGRect forBounds)
        {
            var rect = base.RightViewRect(forBounds);
            rect.X -= 10;
            return rect;
        }
    }
}

Add a custom renderer of ViewCell in iOS project .

[assembly: ExportRenderer(typeof(ViewCell), typeof(MyRenderer))]
namespace App2.iOS
{
    class MyRenderer : ViewCellRenderer
    {
        public override UITableViewCell GetCell(Cell item, UITableViewCell reusableCell, UITableView tv)
        {
            var cell = base.GetCell(item, reusableCell, tv);
            cell.SelectionStyle = UITableViewCellSelectionStyle.None;

            return cell;
        }
    }

UrlScheme is used to navigate between different applications.
Assign your first set on your mssDevMicrosoftExcel application. And the white list set should be assigned on another application which wants to open your first application.
Finally, the effect could be like:

We need to use custom renderer to change the offset of listview as there's no such API on Forms can make it.
Firstly, create a custom list view on Forms with some events like:

public class CustomListView : ListView
{
    public event EventHandler<double> ScrollEvent;

    public void TriggerScrollEvent(double offset)
    {
        ScrollEvent?.Invoke(this, offset);
    }
}

Secondly, we need to register this event in renderer to change the offset like:

[assembly: ExportRenderer(typeof(CustomListView), typeof(CustomListViewRenderer))]
namespace ListViewSample.UWP
{
    public class CustomListViewRenderer : ListViewRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.Loaded += Control_Loaded;
            }
            if (e.NewElement != null)
            {
                ((CustomListView)e.NewElement).ScrollEvent += (sender, offset) =>
                {
                    scrollView.ChangeView(null, offset, null);
                };
            }
        }

        Windows.UI.Xaml.Controls.ScrollViewer scrollView;
        private void Control_Loaded(object sender, RoutedEventArgs e)
        {
            scrollView = MyFindChildOfType<Windows.UI.Xaml.Controls.ScrollViewer>(List as Windows.UI.Xaml.Controls.ListView);
        }

        public static T MyFindChildOfType<T>(DependencyObject root) where T : class
        {
            var MyQueue = new Queue<DependencyObject>();
            MyQueue.Enqueue(root);
            while (MyQueue.Count > 0)
            {
                DependencyObject current = MyQueue.Dequeue();
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(current); i++)
                {
                    var child = VisualTreeHelper.GetChild(current, i);
                    var typedChild = child as T;
                    if (typedChild != null)
                    {
                        return typedChild;
                    }
                    MyQueue.Enqueue(child);
                }
            }
            return null;
        }
    }  
}

We need to retrieve the scroll viewer in the list view through visual tree here so that the list view's offset could be changed.
Finally, register the scrolled event of list view on Forms to get the offset and then trigger the event to notify the custom renderer to make some changing:

double offsetY;
private void MyListView_Scrolled(object sender, ScrolledEventArgs e)
{
    offsetY = e.ScrollY;
}

private void Button_Clicked(object sender, EventArgs e)
{
    List<string> newList = new List<string>();
    for (int i=0; i<100; i++)
    {
        newList.Add("NewItem" + i);
    }

    ViewModel.Items = newList;
    MyListView.TriggerScrollEvent(offsetY);
}

Create a sample here for your reference.

Xamarin.Forms.Entry doesn't provide the Padding property. Try to achieve this feature on each platform using Custom Renderer.

[assembly: ExportRenderer(typeof(CustomEntry), typeof(CustomEntryRenderer))]
namespace App19F_4.Droid
{
    public class CustomEntryRenderer : EntryRenderer
    {
        public CustomEntryRenderer(Context context) : base(context)
        {
        }

        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            Control.SetPadding(10, 1, 0, 0);
        }
    }
}

Similar issue link: https://stackoverflow.com/a/57093811/11083277

Try to create a custom renderer for webview ,and override shouldInterceptRequest(WebView, WebResourceRequest) function , you can check if the request is coming from an ad URL , details refer https://stackoverflow.com/a/39152846/8187800 .

you can migrate to use another library which support xamarin or you can create Binding Library for your provider SDK