Thanks Ronni, the external drive is formatted as Mac OS Extend journaled and 
used exclusively for the Photos library and nothing else currently. The Time 
Machine Backup of Joanne’s MBP (with External drive included in the backup) is 
wirelessly to the Time Capsule onboard 3TB internal drive. 

In contrast as well, my own MBP which has my Photos library also stored on my 
own external drive, does not have this weird behaviour. 

It’s not a big deal to force it via Option key but just curious about how I 
might correct this

I’ll have a read of the link soon. Thanks for comments.

Regards


Pete

> On 6 Jan 2019, at 1:40 pm, Ronni Brown <[email protected]> wrote:
> 
> Hi Peter,
> 
> I’m not sure what has happened here.
> The System Photo Library is the only library that can be used with iCloud 
> Photo Library, iCloud Photo Sharing, and My Photo Stream.
> 
> Photos may have problems to remember the location of your system Photo 
> Library, if it is on a drive with an incompatible file system or if the drive 
> has been used with Time Machine. 
> 
> “If a Photos library is located on an external drive, don’t use Time Machine 
> to store a backup on that external drive. The permissions for your Photos 
> library may conflict with those for the Time Machine backup.”
> 
> After moving your photo library to another location such as an external 
> storage device, making it your new System Photo Library lets you continue 
> using iCloud Photo Library and other iCloud services with photos in that 
> library.
> 
> Keep in mind that in order to use iCloud Photo Library, iCloud Photo Sharing 
> and My Photo Stream, the external storage device must be formatted using Mac 
> OS Extended (Journaled) format, also known as HFS+.
> 
> Apple on its parts warns that enabling iCloud Photo Library after designating 
> a new System Photo Library will merge the photos stored in iCloud with those 
> in the new System Photo Library.
> 
> https://support.apple.com/en-au/HT204414
> 
> Regards,
> 
> Ronni
> 
>  Ronni Brown’s iPad Pro 12.9-inch 256GB 
> 
> 
>> On 6 Jan 2019, at 12:02 pm, Peter Crisp <[email protected]> wrote:
>> 
>> Hi Mac users. A few months back I did a change from HDD to SSD for my wife’s 
>> Macbook with a RAM upgrade at the same time. That has been very successful 
>> like a number of other previous occasions for other family members. There is 
>> one annoying thing that has started since then relating to how the Photos 
>> library gets called up when opening Photos. The Photos library is on an 
>> external drive. I have gone through the process of using Option when 
>> opening, directing it to the externally located Photos library, then in 
>> Prefs, making sure it is selected as the System library. 
>> 
>> Now though, if I open Photos (without holding Option key), the Mac thinks I 
>> am a first time user and brings me to the ‘Get Started’ screen. If I 
>> proceed, it opens Photos and eventually locates the Photos library (on the 
>> external) but this leaves Photos in a state where the iCloud Shared albums 
>> are not seen. In this arrangement upon checking Prefs, it seems to infer the 
>> Photos library on the external drive is the System library.
>> 
>> If I close and then reopen Photos holding Option key, I can force it to open 
>> the Photos library on the external drive, BUT the Shared folders now do 
>> present themselves and all sharing functions that normally work all do in 
>> fact work. It also indicates that the selected Photos library (ext drive) is 
>> the System library. 
>> 
>> Next time I open Photos (no Option key), it reverts to the First User state. 
>> Is there a stored file (plist or some other) that I can blow away to restore 
>> this to the correct System library for every time? It’s fine for me to 
>> workaround this but my wife doesn’t want to have to do this as a constant 
>> workaround. 
>> 
>> Regards
>> 
>> 
>> Pete
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