Voyager has a full-fledged Media Manager which allows you to upload files, re-name files, and delete files. You can also add new folders and move files/folders. Basically anything that you would be able to do in any type of Media Manager you can do so in the Voyager Media Manager.
You may also drag and drop files onto the 'upload' button to upload multiple files. The media manager allows you to create thumbnails and add watermarks to uploaded images through the configuration file. Please visit the media-picker documentation to learn about the configuration options.