For this showcase we added a dropzone on our demo admin dashboard page, which allows you to upload multiple images. You can do that easily with DMXzone DropZone Add-on and HTML5 File Upload extensions. Keep in mind that we disabled the actual upload for the purposes of this demo. Also, only images are allowed for upload but you get to see the awesome live preview.
DMXzone DropZone Manual
November 18, 2015
Admin Dashboard with Multi Upload Showcase