@bodyhealth Oh, no problem! I enjoy working out your ideas.
In regards to your question: Yes, that method also works if you want to display a gallery through a button.
The way I was able to get it to work is by placing a tab inside of the modal, placing an image in the tab container, and placing the same image in the tab link so that when a user clicks on the image it takes them to the container with the correlating image.
You could even put a slider inside of the modal if that is something more of what you're looking for.
Take a look at my quick screencapture to see how your can complete the gallery: https://drive.google.com/file/d/0BynZs0dQwPd_OFRlNEJVS29OQWc/view
Also, the following is the Webflow share link: https://preview.webflow.com/preview/button-lightbox-with-gallery?preview=a6e9549b44216df60fcc3bf76172ca74
Hopefully this helps