Prior to iCloud Photos, I would upload photos from my camera onto my mac. Those photos never transferred over to iCloud Photos. So basically I had 2 photo libraries on my mac - the iCloud Photos and the other one with the older photos. I could toggle between the 2 photo libraries by holding down the Option key and clicking on the photo app. That 2nd library is now no longer available on my mac (maybe because My Photo Stream shut down). I have to believe that my old photos are somewhere on my mac but I can't find them. I've been able to find where the iCloud photos are stored but I can't find photos from my original library. Any advice is greatly appreciated.