The demo site gives you an idea of how the posting process works, but we can't alter it to show more than what you already see/can access - My apologies, I checked and can see there is an actual issue with the demo site preventing you from seeing the second step of the posting process as you would usually be able to (I've notified our team to fix this). What happens though, is that once the category is selected, the second stage of the posting process allows the ad description etc including add image options, and yes you can add multiple images at once. Thanks.