Attaching Files Using An External URL -- Semi-Urgent

I'd like to be able to upload files (attach them to anode) by entering an external url (http or ftp). In this way, you would be uploading from a server, not your local pc. PLEASE DO NOT suggest modules that do this if they do not integrate with the upload module. I am using the upload module and if you do have a suggestion like that, please make sure that I would have some way of transferring my current cheme over to the new module scheme. Example: Let's say you know of a moudle that can do this, explain how I would go about setting it up so that I'm not changing the urls of my current files. I have lots of files, and cannot afford to be messing with the current urls. I really hope I can get some help here. One of the things this forum really suffers from is having items get to the bottom of the page unanswered.