I would like the async upload to automatically postback after I select a file.

Is that possible?

Hi Gerry,

 
You can achieve it by using OnClientFilesUploaded event by manually clicking on the upload button as done in the article or by using AjaxRequest to trigger a postback for upload.

Hope this will be helpful.

Greetings,
Plamen
the Telerik team

Thank you for your answer. You pushed me in the right direction. I wasn't able to implement the method you pointed me to. It could have been that my RadScriptManager was located on the master page while my Upload control was on a User control nested in a page. Anyhow, this is what ended up working for me:

In this case my btnAttach is invisible and is only used to catch the postback on the click event.