if the scrolling gallery is on your listings, yes, as long as the listings are eligible for revision on eBay and there is a valid token in your Auctiva account linking it to your eBay account.
You would need to look for the HTML in the page source for your listings on eBay to see which version you are using - if you find: <!--SG INDICATOR START--> in the HTML of the page, that is the current modern gallery. If you find <!--ASW--> near the gallery code, that listing is using the older version, which uses Flash. You would also see this readily in the Chrome browser as the gallery would require you to use a "Play" button to scroll when viewed in Chrome if it is the older version of the gallery.
In your Auctiva account, under the Gallery tab, there is an option "Get HTML" which has the HTML of the gallery available as well as steps on copying it for use on your listings.