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Link from a caption inside a lightbox

Hello, these past days I’ve been trying to put a link inside a lightbox - for example, in caption of an image.

Users on my site browse photos, and when they are interested in one of them, they need an option to go to another page on my site.

I know @samliew created a custom code for such a purpose, but I’m afraid this master developer is busy.

Any clues about how to do it?