Here is a good reference if you use Facebook to promote your store. It will display any image you choose, instead of Facebook randomly choosing an image.
They are call OG Meta Tags and are placed in the HEAD section of your store.
https://developers.facebook.com/docs/sharing/webmasters
Facebook is limiting users option about marketing their own business without giving Facebook they need (money of course). In a recent announcement they announced it in a tricky way.
Thanks for the update
Hello just what I needed, it has been very useful to me.