[lucianofuentes]

I'm not sure if this little trick of mine is old hat, or if there's some better way that makes mine look silly.

What I do (in any app that exports as an image file) is save to Dropbox, then open the file in Goodreader. GoodReader let's you view the file AND create a link that is a direct URL to Goodreader and the actual file. I use this trick in iThoughts and Omnioutliner to link to images (or any other file including PDFs, image files, videos, even Office docs). If you set them up as synced folders between Dropbox and Goodreader, you can re-edit the files, and provided the names don't change, the links will remain intact.

The outline won't have a "preview" of the doc, but it's a convenient and fast way to access files.