Gallery block with text scrolling simultaniously

Hi, I have a layout that uses a gallery block on the right and a text block on the left. I would like the text to change with every new image that appears as the user scrolls the gallery. There has to be a way to do this! Any help for an uber rookie?
Potential solutions and why they don't work:

-To make one gallery the width of the page and add the text as part of the image on the left. This is problematic in mobile view where I would prefer the text to appear below and not side by side.

-To make two galleries side by side, one with images of text and one with images. The problem is I don't know how to link them so that they scroll simultaneously.

-To make each image text combination a separate page and instead of having someone scroll through a gallery, they press a link to the next page. This seems like it would be slow and unnecessary. I would have tons and tons of pages.

I don't think this has auto-scrolling, but links the image and text using a summary block:

https://www.ghostplugins.com/products/keito-image-changer