Did you Import or Attach the document?

If you imported it, there is no link -- the document has been essentially "copied" into the page.

If you've attached it, you can link to the attachment using the attachment's file name. So if you attached a file called "mydocument.xyz", to a page called "MyPage", you can say either: http://yoursite.jot.com/MyPage/mydocument.xyz, or in script markup mode you can just put double square brackets around the name: [[mydocument.xyz]].

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