Import from FTP/Media library

Hi,

Thanks for contacting us here about this extension.

If I import files from FTP to WP File Download, will they be duplicated in the server?

You can sync folders from the server in WP File Download plugin. Of course, it will not occupy more space on your server.
Please go here for further information:
https://www.joomunited.com/wordpress-documentation/wp-file-download/227-wp-file-download-configuration#toc-4-server-folder-sync

Cheers,