iOS Question WKWebView in IOS13 stopped working

Dim filename as string = "page.pdf"

If File.Exists(File.DirAssets, filename) Then
    WKWebViewHelp.LoadHtml(File.ReadString(File.DirAssets, filename))
end if

    Dim fileName As String = la(Index,0) & ".pdf"
    If File.Exists(File.DirAssets, fileName) Then
        WKWebView1.LoadHtml(File.ReadString(File.DirAssets, fileName))
    End If

    Dim xui As XUI
    File.Copy(File.DirAssets, la(Index,0) & ".pdf", File.DirDocuments, "page.pdf")
    WKWebView1.LoadUrl(xui.FileUri(File.DirDocuments, "page.pdf"))

File.Copy(File.DirAssets, "1.pdf", File.DirDocuments, "1.pdf")
WKWebView1.LoadUrl(xui.FileUri(File.DirDocuments, "1.pdf"))


Sub WKWebView1_PageFinished (Success As Boolean, Url As String)
    Log(Success)
    Log(Url)
End Sub

CustomListView1_ItemClick(currentLesson,"")

    Dim xui As XUI
    File.Copy(File.DirAssets, la(Index,0) & ".pdf", File.DirDocuments, fileName)
    If File.Exists(File.dirdocuments, fileName) Then
        WKWebView1.LoadUrl(xui.FileUri(File.DirDocuments, fileName))
    End If