Add Images: As soon as you click on this button you can add images to listing from WordPress media structure.
Remove All Images: In this section you can remove all available images for current listing.
Image Drag Icon: you can change the order of images they will show according to order that you define in the frontend.
Image Delete Icon: If you feel one image is not good and you want to remove and add new simply click on “Image Delete Icon” which is available in the bottom of image and delete that specific image.

Front-end view: