I'm trying to resize an animated gif that I have set to appear on hover, having placed it along with a static gif of the same image as background images. When I click on the image name in the background images section, changing the image dimensions appears to do nothing. I've attached the sharing link below, and an animated screen capture gif to show what I'm seeing. As the screen capture shows, if I change the dimensions of the static image of the bird, it changes its size. But if I change the animated gif dimensions, nothing changes.
Also, I wonder how come there's no box to check to constrain proportions in this image adjust area. If you have a non square image, I've had to use Photoshop to figure out what the image proportions should be in px when resizing.