I have iOS 8 iphone and iOS9 iPad. Both uses the same icloud account. Settings > iCloud > Photos>iCloud Photo Library is on for both.
They never uploaded any photo to iCloud. They are always in "x photos uploading" phase.
My wireless is working. My another iPad which using another icloud account is working properly in the same place. I restarted many times, made iCloud Photo Library off and on again. But nothing worked. I have 4,5GB empty space on my iCloud.
