This is a File & Folder Viewer Plugin of FTP folder for WordPress sites.
So using the shortcode [library-viewer], you can print the containing folders & files of your library in front-end of a WP site.

With Library Viewer you can display the containing files and the containing folders of a "specific folder" of your (FTP) server to your users in the front-end.
The significant difference from other similar plugins is that:

  1. Can allow users to view that the files exist, but cannot open them if they are not logged in (or if the are not administrators, or authors etc...)
  2. Can allow users to view files in a custom viewer or redirect them through a RESTful web service of your choice.

For more details and use instructions you can read the readme file

If you want extend the functionality of Library Viewer, you can read about Library Viewer Pro