How exactly can i activate the Lightbox that is used on single-product pages for other images? Do i have to set certain classes or attributes on the a-tag?
I build some extra stuff in code, so i won’t use the visual composer.
Unfortunately, Photoswipe popup is available only for products gallery. And if you want to use it for other images probably you will need to add some JS code and use specific HTML markup. Here is a library documentation where you can find some examples how you can use it http://photoswipe.com/documentation/getting-started.html