The FileUploaded event doesn't fire when you hit the browse button. It fires for each file, when the file is already uploaded to the handler and after a postback occurs (for instance a button click).
You can also get the uploaded files inside the button click event, without the FileUploaded event. Just use the RadAsyncUpload's UploadedFiles property.
Here is an example on how you can save all the files in a folder called "Files" in the ButtonClicked event:
sender, EventArgs e)
path = Server.MapPath(
file.SaveAs(path + file.FileName);
All the best,
the Telerik team
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