display PDF in webview not working Xamarin forms

i am trying to display a hosted IMAGE from a secure web api it working

    <WebView
                    HorizontalOptions="FillAndExpand"
                    Source="*://192.168.137.1:3581/Uploads/04-02_1.jpg"
                    VerticalOptions="FillAndExpand" />

but trying to display a hosted PDF from a secure web api it not working

<WebView
                HorizontalOptions="FillAndExpand"
                Source="*://192.168.137.1:3581/Uploads/3.pdf"
                VerticalOptions="FillAndExpand" />

*= http