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Stagger the Opacity Animation of Images pulled from CMS

I have a splash page with a grid of images. I’d like to stagger the animations of each image throughout the grid once the page stops loading.

Trouble is, the images are pulled from a CMS, and thus I have only one Collection List.

How could I stagger the animations of each image? Is there a way to identify the index of each and animate this way? Thank you!

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