Setting the UploadType to "IFrame" solves the problem, but when I tried with a large file, I got Maximum Request Length Exceeded, which is the error we used to get when using the standard asp.net FileUpload control with large files.

 

What are the limitations of using the IFrame upload type?  Does the entire file get loaded into server memory on postback?  We won't be able to live with that as some of our files will be quite large.  Please advise.

 

Thanks,

Brad