Dynamic Product Ads support deep links into your mobile app if these links are available in Facebook.
You can add app links for your mobile app(s) to the product feed you send to us at StitcherAds. Guidance on how to do this can be found here.
We want your customers to have the best possible experience so we have enabled these deep links by default. Essentially this means that if Facebook has the appropriate links when it serves the dynamic ad on a mobile device, rather than directing your customer to the website, it will serve links to your mobile app instead.
You can of course disable this behaviour using this checkbox that you will find at the bottom of the create panel.