Hi!
Thank you for your answer.
I think I may not have explained it very clearly, so here’s a bit more detail:

On my portfolio overview page, I display only one or a few images per project, using separate modules for each project (for example, a Grid module per series).
What I would like is that when a user clicks on one of these images, the lightbox opens and displays all the images belonging to that specific project, not just the ones visible in that module or on that page.

I don’t want the lightbox to show all images from the same page/module, I would like to show a larger gallery of images, corresponding to the full project/series that image belongs to, even if most of those images are not on the page.

Is there a way to link a lightbox thumbnail to a full hidden gallery or project set? Or a recommended approach (custom post, shortcode, plugin, etc.) to achieve this behavior?

Ok, thank you!