Why am I unable to see my Aperture images in Photos

Due to the discontinuation of Aperture, I allowed Photos to import all of my images into it's Library. It created a folder entitled "Photos Library 2", however, I'm unable to view any of the images in it in Photos. All of my iPhoto images are in a library entitled "Photos Library" and I'm able to see all of them. What's the secret to seeing the Aperture images?