1. Create a folder on the Documents tab to which all usershave access.
2. Upload the document to that folder.
3. From the Documents tab, choose the folder and click Go.
4. Click View next to the document.
5. Copy the document’s URL from the browser. For example, https://na1.salesforce.com/servlet/servlet.FileDownload?file=015300000000xvU.
6. Use everything after the domain portion of the URL to create your custom link. Using the example in theprevious step, your link would point to /servlet/servlet.FileDownload?file=015300000000xvU.