Hello Shaun Peet,
The POST request made made by RadUpload is a regular POST triggered by a input[type='submit']. The same post request would be triggered by each and every submit on the page. In this sense, It is the same whether you use RadUpload or the standard FileUpload for ASP.NET, they use the same post request. I am aware of the Cloud Fire policies regarding file upload, but I believe they should support normal upload requests. Perhaps an HTTP log from fiddler cap
would shed some light on what is going wrong.
the Telerik team