Trigger an image gallery with a button?

Is there a way to trigger an image gallery with a button?

Maybe something like this?

Focus:
https://elixirgraphics.com/previews/focus/

…I added Gallery Stack 3 from InStacks for the image gallery…

This looks like it will do what I want. Can you explain more about Gallery Stack 3? How it’s used inside Focus?

Hope you can see it in the picture:
I added the Gallery 3 Stack to the Modal Content in the Focus Stack…