I used this solution for three years.
I am not using this solution anymore, but I had Visual Studio and Xamarin installed — we were using components of Xamarin.
We were trying to integrate some PSPDFKit functionality. We wanted to open up a PDF document to the last page that the person opened it. If it was a five-page document and they opened it on page two and then when they closed it, they wanted it to open back up to the page where they left off. They were trying to get the PDF to be sticky.