OK, Sorry to be confusing. And yes, you may be correct, it could be process and might not be documented clearly that there is only one prescribed startup procedure to according to iCloud Photo Library FAQ - Apple Support:support.apple.com/en-us/HT204264:
How do I turn on iCloud Photo Library?
If you want to turn on iCloud Photo Library on all of your devices, follow these steps:
- On your iPhone, iPad, or iPod touch with iOS 8.3 or later, go to Settings > iCloud > Photos, then turn on iCloud Photo Library.
- On your Mac with OS X 10.10.3 or later, go to System Preferences > iCloud > Options next to Photos, then select iCloud Photo Library.
- On Apple TV (4th generation) with tvOS 9.2 or later, go to Settings > Accounts > iCloud > iCloud Photo Library.
This was a debugging procedure after I noticed that image counts were mismatched across the three platforms, iCloud, iOS Photos and OS X Photos or ImageCapture. I had built my photo library over time, from iPhotos to Aperture and then to Photos on OS X., then began using iPhone exclusively for photography. This would not be a sequence of the current masses, so I began reconstructing, first by importing my photos to the Mac.
Yes, perhaps my logic is faulty as believing this is a simple database issue; but after "zeroing" out all but Photos app on the iPhone (a starting point many folks would use) I began rebuilding and the various import regimens showed image count discrepancies. This has been reported numerous times, elsewhere in the Support blogs.
I have not been able to utilize any of the "so called" fixes with 100% certainty of apparent non image loss during transfer. It is exactly a chicken and egg proposition; and yes, others have been successful and other have not been, in terms of consistent image counts.
Finally, inconsistency of the various platforms look-and-feel has been increasing since the parting of Steve Jobs, a sad commentary on fragmented development; perhaps unavoidable with current leadership.
Thank you for your attention and patience, I have a couple approaches to try based upon your input, set up my empty OS X Photos on iCloud and proceed from there.
Best regards, R.J. Wilson