You can skip that new window step by just right-clicking URL and choosing "copy URL" or "copy link location" or whatever your browser of choice calls it, then closing the "Manage Attachments" box....After you find the file on your computer and upload it, the "Manage Attachments" box shows the URL of the file you just uploaded in blue. Click on that URL, and it opens up in a new window. Click on the URL bar and select it, then hit Ctrl-C to copy....