'See more' button for screenshot/ image testimonials

I would love to be able to restrict the number of screenshot testimonials in an image gallery so there could be a ‘See more’ button, just like the masonry gallery.

I’m screenshotting quite a few bits and bobs from LinkedIn, and it all looks great on the desktop version of my website, but the mobile view ends up with lots and lots of photos to scroll through. A ‘see more’ button would save the day. Thank you :D