I've previously tried manually adding the link via an HTML block like you suggest. If I click the link directly it opens the YouTube video in the lightbox, but the video still does not show up when navigating using arrow keys through the lightbox. I've updated the link so you can see. If I click the first photo and arrow through the rest, the photos on either side are shown but the video is skipped. Is there a way to get the "slideshow" style mode in the lightbox to see both the YouTube videos and photos as I step through them?

Thank you.