Hi,
I am not sure what do you mean .
Who provide the URL ? User or Server Code ?
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1 - when the browsing dialog opened , if an user paste an URL and press OK , IE will save it to a temp location and let Uploader to upload it.
2 - on server side, you can use System.Net.WebRequest to download the data to server, and pass the data to Uploader.Upload method.
Regards,
Terry