https://codecanyon.net/item/wordpress-real-media-library-media-categories-folders/13155134

Turn your WordPress media library to the next level with folders / categories. Get organized with thousands of images. Organize media into folders. RML (Real Media Library) is one of the most wanted media wordpress plugins. It is easy to use and it allows you to organize your thousands of images in folders. It is similar to wordpress categories like in the posts.