On an existing website running under Wordpress, there is a gallery made with the AdvancedCustomFields (ACF) gallery plugin.
You just need to adjust the PHP Template in a way, that it shows the title of the gallery in a <h2> Element, and the images after that, and when you click the images, then the title of the next gallery and the images belonging to it and so on. When you click on an image it should open in a lightbox.
Can very quickly be done I think.
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