Open/Collapse images above title (custom fields?)

Hi everyone,

I’m working on this website: https://nilaska.dk/blog/

As you can see my posts are build up this way:

image (content)
title
text (content)

I want most things happen on the front page, therefore I’m working on making the posts collape/open by a click on a link under the text. So if you click a “open case” link, more images will reveal in between the image and title. So kinda like this:

image
(hide)
image
image
image
image
(/hide)
title
text (content)
open case link.

Do you have any ideas how to make this possible?

If its possible with custom fields, I believe that it would be the best solution. Because currently I just hide the post-title (display:none) and type a h2 in the content field. I’ve stumbled by solutions with custom fields to place one featured image above the title, but in this case it is more than one image and I don’t know the number of images. Plus I want to open/collapse them.

Thanks!