You can make sub-directories in the upload directory, and move files into them.
Maybe the second-best Gallery plugin for WordPress
Bulk organise your media attachments, custom post types, pages and posts into folders. A perfect addition to sites with large amounts of pages, posts
Simple plugin that checks your WordPress install and shows your file permissions, size, and last modified date.
Easier file and folder management for WordPress Media Library for Galleries and Albums
GoogleDrive folder list allows you to insert a document list from any shared folder in Google Drive without Google authentication.
Protect folders and files from unhautorized changes managing filesystem permissions.
This plugin easily displays the folders and files from a selected directory. It can be placed by shortcode in any post.
Very basic and private file storage for groups.
Displays a hierarchial tree, similar to widows explorer folder tree. Can be used as a geneological tree , a file tree, you decide.
Organize WordPress Drafts with "Draft Types." Think of draft types as folders for sorting your drafts.
Any images, photos, pictures from your DropBox Public folder now are accessible to view in sidebar gallery of your blog.
The EW Gallery Plugin allows you to organize photos and YouTube videos on your WordPress website into folders and display each folder in its own Jssor