The administrator area Media Centre allows the site manager to upload images for Property Features and Room types to the server for use by the Property Feature and Room Types editing pages. At the top of the page is a dropdown that allows you to choose whether the images you're uploading are for Property Features or Room types. When this is changed then the column on the left hand side will change to show all images available to that resource. From there you can delete any images you don't want, and view the full sized images. On the right hand side there's a button "Add Images". Click that to add multiple images to the right hand column. Once selected you can choose to upload the images either one at a time or all at the same time.