Do documents have to be public?

I am hoping to use WP Document Revisions with Members plugin to create a private members area on a website where members can download documents. However if I make the documents private they don’t show up when using any of the shortcodes or viewing the www…./documents page. Am I going about this the wrong way or would documents have to be public even when users are signing in to the site?

http://wordpress.org/plugins/wp-document-revisions/