Android Question FileChooser

[mrostamian]

Hello I have from the library webkitwebview I use it and ran into a problem.
I try to download the file with the following command, but unfortunately all the files are inactive and I am not allowed to select the file.
what is the solution?

Sub WebkitWebView1_FileChooserInitialized (FilePathCallback As Object, FileChooserParams As WebkitFileChooserParams)
    WebkitWebView1.WebChromeClient.FileChooserStart(FilePathCallback,FileChooserParams,True)
End Sub

Meanwhile, I entered all the accesses that were mentioned in the description in the manifest.
Thank you for helping me.