Then I'm afraid I do not understand iCloud. I have an iPhone, an iPad and a Mac and my wife as another iPhone. We are part of a family according to iTunes.
I expected that when I enabled iCloud Photo Library on my iPhone AND on my iPad I would have merged the two libraries into one, but this is not happening. Then I'm asking what is the purpose of this product.
The description page says:
"Every photo and video you take lives in iCloud — giving you the freedom to access your library from any device, anytime you want. So you can view a photo from last week or last year no matter where you are.", which is not true because none of the picture taken with the iPad are available on iCloud and none of the picture on iCloud are available on the iPad.
"iCloud Photo Library helps you make the most of the space available on your Apple devices by automatically storing the original high-resolution photos and videos in iCloud and leaving behind the lightweight versions that are perfectly sized for each device", again not true. The iPad is complaining that there is almost no space left on the device (114 MB free), but it does not use iCloud and it does not free any space.
I guess that if I ever add my wife's iPhone or the Mac I would not get their pictures in my iCloud Photo Library neither, am I right?
Not to mention that it is considerably more expensive than concurrency. Carousel by Dropbox works way better in my experience. I may be OK to spend more for a better service, but at present iCloud is far from Dropbox.