Update.  For the benefit of anyone else having similar problems with iCloud 
syncing ‘stuck’.

I now have a reasonable degree of confidence that Photos has been sorted and 
will now correctly sync with iCloud over four devices. 
This has not been the easy process I had expected.   I discovered that creating 
a new library I could keep the original library and not risk losing data. Only 
one library can be the ‘system library’ and sync with iCloud. 

I have one computer that is ticked to download originals and that computer is 
now showing ‘all up to date’ in Photos. Yay.

My mobile devices have always synced well with iCloud and update any changes 
immediately.

My laptop had been refusing to sync correctly with iCloud and was stuck for a 
week. After signing out of iCloud, restarting the computer in Safe Mode, then 
restarting again in normal mode, rebuilding the Photo Library with no change,  
I ended up creating a new Library, then turned iCloud syncing back on and it is 
currently downloading the contents of my iCloud photo gallery, some 50Gb, so 
will take a while.   

I lost track of how many times I found  Photos trying to upload the entire 
15000 photos to iCloud, at least five,  and am grateful to have a 1000Gb plan 
with Bigpond on cable so had the capacity for such nonsense. 

I expect my problems are now on the way to being resolved. Looking forward to 
happy Photos syncing in the New Year.

Regards

Tim


> On 23 Dec 2016, at 7:28 PM, Tim Law <[email protected]> wrote:
> 
> EEEk,,,   :-(
> 
> Restarted Mac Mini.
> This got the upload moving again - yay. 
> 
> "uploading 100 to go"
> "50 to go" looking good.
> "uploading 1 item"
> 
> Success I’m thinking.
> Suddenly it is uploading 15,827 items - AGAIN!
> 
> Sigh …..
> 
> I’ve quit Photos and will see what mood it is in tomorrow. 
> 
> Cheers
> 
> Tim
> 
> 
> 
> 
>> On 23 Dec 2016, at 6:35 PM, Tim Law <[email protected]> wrote:
>> 
>> Good evening,
>> 
>> I am hoping to find out how to reset the sync data to force one computer to 
>> reset the sync data for loading Photos to iCloud
>> 
>> Two weeks, or more, ago, I turned on iCloud storage for Photos on four 
>> devices. 
>> All are logged into the same iCloud account, although some are @me.com and 
>> some are @mac.com email address names. I understand this is insignificant. I 
>> have checked at https://appleid.apple.com/ and found all four devices are 
>> logged into the same Apple ID
>> 
>> Mac Mini - 10.11.6  Cannot be upgraded to Sierra
>> Mac Book Pro   macOS 10.12.1
>> iPhone 6S    iOS 10.1.1
>> iPad Air 2  iOS 10.1.1
>> 
>> In order to keep a current back-up, I have turned on ‘Download originals to 
>> this Mac’ on the Mac Mini which is my ‘main’ computer. Data is backed up 
>> using Time Machine and Super Duper.
>> 
>> All the mobile devices have the same number of photos and videos as each 
>> other and as is https://www.icloud.com/#photos2  which is 15,003
>> The Mac Mini registers it should have 14752.
>> 
>> The Mac Mini is Stuck at uploading an extra 1878 photos and has been for 
>> over 24 hours. This is the second time this has happened and it has taken a 
>> week to upload the 55Gb of data a second time. Photo’s triggered itself into 
>> a reload of all photos after I turned off iCloud Photo Library in an effort 
>> to get the devices correctly syncing. 
>> 
>> When I delete, or add, a photo to any of the mobile devices, it is shared to 
>> the other mobile devices quickly. 
>> Photos on the Mac Mini has kept several photos that have been deleted for 
>> days on the other devices. 
>> 
>> During the week I can see the CPU working hard on iCloud or Photos, then I 
>> see the upload loading to iCloud. It varies between activity on both, but 
>> once ‘stuck’ on 1878 to go, there is no activity showing. 
>> 
>> I have tried the Pause for One Day button in Photos but nothing forces the 
>> reset and correction as I thought it would.
>> 
>> I think I need to find a file that contains the sync data and remove it as I 
>> suspect it has got corrupted somehow. 
>> 
>> Is there such a file and are my ideas sensible or is there another option. 
>> 
>> I’ve been patient for two or more weeks with Photos and iCloud - like the 
>> forums suggest - now is the time for a hammer!!  kidding
>> 
>> 
>> Ideas welcome.
>> 
>> What about turning off iCloud Photo Library, deleting all the photos in the 
>> Mac Mini library….. eeeek….. and then turning it back on again so all the 
>> 55Gb will download. That sounds scary.
>> 
>> Cheers
>> 
>> 
>> 
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