Hi Jinal,
As we mentioned earlier, we do not have support for adding annotation in our PDF viewer control in Xamarin.Forms (iOS, Android and UWP). We have plans to implement the below features in our Essential Studio 2017 Volume 2 release.
· Text Mark Up annotation (Highlight Annotation)
· Shapes Annotation (Line, Rectangle and Ellipse)
· Lines and Arrow Annotation
Please let me know if you have any other requirement.
Thanks,
Balasubramanian S