Why isn't my background looping

I have used one of the looping backgrounds episode offers but it isn’t looping

If it isn’t working, then save the background, then go to an image converter website

I use this website, so this website can help you resize the background: Convert image to PNG

Then follow these directions on Dara website. This will help., and make sure to give credits to @Dara.Amarie when using her looping template.