What value are you setting in the "File Name" property of the Download widget?
Are you concatenating the filename and type you retrieved from the Upload widget? If so there is your problem, you only need to pass the filename value as it already contains the file extension. The type you can use in the "Mime-Type" property of the Download widget.
Are you concatenating the filename and type you retrieved from the Upload widget? If so there is your problem, you only need to pass the filename value as it already contains the file extension. The type you can use in the "Mime-Type" property of the Download widget.