If you just subscribed to flash gallery, but have under 20 listings, your flash gallery won’t work.
Flash Gallery’s main purpose is to cross sell your other items when a buyer is looking at a certain listings. The way it’s done is by using an algorithm that calculates the connections between your listings and displaying your 16 most relevant items. So in order to show 16 of your most relevant items you will need to have at least 20 listings.
If you have any other questions relating to our flash gallery app feel free to comment below.