I was going to add a photo to the glitches gallery and when I was done, I hit the check button that said, "Create an automatically updated slideshow of new photos." I clicked on it because I thought it would update my photos with the other photos, but it turned out that I accidentally added more photos. Some of the photos were unrelated to the glitches, so I had to undo my edit. What does, "Create an automatically updated slideshow with new photoes mean?"