Error with AsyncFileUpload in DotNetNuke

Has anyone succeeded in using AsyncFileUpload in DotNetNuke? Although the module is marked as "allow partial render", I get two errors in web page, as alerts:

Unhandled exception: Access is denied

and

Unhandled exception: the requested file uploading problem

How can I solv开发者_Go百科e it? The classical input type="file" is not working with ASP.NET AJAX.

I believe classic input type=file does not work within an AJAX UpdatePanel as the file does not get posted to the server. You can get around this by using a PostBackTrigger (http://www.codeproject.com/KB/ajax/simpleajaxupload.aspx).

I'm afraid I'm not sure about why it won't work in DNN.