Plugin for attachment (media files) downloads

Hi. I need a list of files that my subscribers can download. Specifically PDFs. I have added the categories and tag taxonomies to the attachments and had them listed on a page. The problem is that PDFs doesn't have thumbnails. I need the thumbnail and preferably a separate tab within the WP admin so the Authors have a dedicated area to add/edit/delete this category of attachments. I also looked into Custom Press but I can only see options to create post and not list of files with "download" call to action instead of "read more".