Using The Documents Library - Eonic/ProteanCMS GitHub Wiki
The process is relatively the same as using the image library
When linking through to a document on your website you will need to know the name of the uploaded file
Copy the whole name and file extension, ie. pdf of your targeted document and prefix /docs/
For example, if your document name is Terms-and-Conditions-Download you can use the file path:
/docs/Terms-and-Conditions-Download.pdf
If you are using a file structure for your documents remember to add this into the path. If the above file was placed in a folder called 'user-downloads ' the path would be:
/docs/user-downloads/Terms-and-Conditions-Download.pdf