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Main CMS Image - Pulling in too many images

HI, I have an ecommerce page and I’m trying to replicate the image gallery that Webflow showed in this Youtube video. They don’t go into detail for every step of how they set it up in the video:

Their final result looks like this, with a large main image and smaller lightbox images:

I tried to set this up in my ecommerce page but for the main image, it’s pulling in ALL of the product images across All of the different products instead of just the image that is specific to the product page.

Also the thumbnail images are all in one multi-image field in the CMS but you have to click on each image individually to pull up the lightbox instead of being able to scroll through them.

Any ideas?