IWithDownloads

Example

var webViewWithDownloads = webViewPrefab.WebView as IWithDownloads;
if (webViewWithDownloads != null) {
    webViewWithDownloads.SetDownloadsEnabled(true);
    webViewWithDownloads.DownloadProgressChanged += (sender, eventArgs) => {
        Debug.Log(
            $@"DownloadProgressChanged:
            Type: {eventArgs.Type},
            Url: {eventArgs.Url},
            Progress: {eventArgs.Progress},
            FilePath: {eventArgs.FilePath},
            ContentType: {eventArgs.ContentType}"
        );
        if (eventArgs.Type == ProgressChangeType.Finished) {
            Debug.Log("Download finished");
            File.Move(eventArgs.FilePath, someOtherLocation);
        }
    };
}