The value in the "Path" column below can be pasted into the "URL" field of the link dialog on the page editor. Be sure to set the "protocol" pulldown there to "other". To link to a file from any other website (or e-mail, etc) create the full address by prefixing it with "http://~$host~"
Use the "Add a new file" link below to upload a file, then come back to this page.
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Select the value in the "Path" column below and copy it to the clipboard.
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Open the page editor for the page where you'd like the download link to appear. (Open the editor in another tab/window so you can still refer to these instructions.)
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In the page editor, type the text you'd like people to click on to download the file, then select this text and click the "link" button in the editor (it looks like a globe and a chain).
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Paste the "Path" (that you copied earlier from below) into the "URL" field, and set the "Protocol" field to "<other>". Click OK to close the link dialog.