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How to make slider with thumbnails

I’ve been searching for a couple weeks now, and I’m still scratching my head on this one. I want to make a slider that has a big slide in the background and smaller thumbnail slides on top, but I don’t want to have it display all the slides as thumbnails that can only be clicked. I want a timed interaction + thumbnails that can be clicked.

I’ve animated what it looks like in after effects;

I’d really appreciate advice on how to get as close to that ^ as possible

I’ve come across @sabanna’s thread already, and that’s quite close, but the thumbnails don’t swap when it rolls into the next slide as in my animation above

Thanks in advance!

Here is my public share link: LINK
(how to access public share link)