website in webview Xamarin Forms upload file

Question

I have my MainPage.xaml with my webview:

 <WebView VerticalOptions="FillAndExpand" Navigating="OnNavigating" Navigated="OnNavigated" HorizontalOptions="FillAndExpand" x:Name="loadVideo_wv"  />

in my MainPage.xaml.cs i load link:

loadVideo_wv.Source =link;

I add permission in my manifest to read files but when i want to upload a file, i have this:

[EGL_emulation] eglMakeCurrent: 0xd661a300: ver 2 0 (tinfo 0xd660ff80)

[eglCodecCommon] setVertexArrayObject: set vao to 1 (1) 0 0 [EGL_emulation] eglMakeCurrent: 0xd661a300: ver 2 0 (tinfo 0xd660ff80) [chromium] [WARNING:spdy_session.cc(3180)] Received WINDOW_UPDATE for invalid stream 9 [chromium] [INFO:CONSOLE(1)] "Unrecognized feature: 'payment'.", source: https://js.stripe.com/v3/ (1) [chromium] [WARNING:spdy_session.cc(3180)] Received WINDOW_UPDATE for invalid stream 9 [chatty] uid=10147(com.sqinteiro.locnwork) Chrome_IOThread identical 1 line [chromium] [WARNING:spdy_session.cc(3180)] Received WINDOW_UPDATE for invalid stream 9

How can i resolve this ?

Thanks in advance.