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Image lightbox adding thumbnails and images individually

I’m trying to add an image lightbox.

I have 18 images with 18 corresonding thumbnails.

Is it correct I have to add each and every one individually, which means 36 images need uploading and the process repeated the same number of times?

This seems like a lot of work timewise and really cumbersome.

I’m not using the CMS so it’s a static build.

Here is my site Read-Only:
(how to share your site Read-Only link)

Please update your read-only link.

Apologies. Updated now.