I see that the videos in your grid aren't shown square even though you've selected square as the fixed aspect ratio. The image previews are though. I'll add this to the list of things to fix! :-)
Hi again Nick, and others who are using videos in the Related Image Gallery includelet.
I've fixed this so that the video thumbnails obey the aspect ratio, and made it so they don't go too big if they're portrait. So you can safely use the Large modal size now too without losing half the video.
