Sometimes It’s Better to Just Start Over With iCloud Photo Library Syncing
I did some searching on the web and eventually stumbled on a thread that suggested signing out of iCloud and then signing back in. This makes some sense, because all of these Continuity features go through iCloud. So I did that on the iPhone, and, long story short, that seemed to fix the issue. After one more reboot of the phone, Instant Hotspot was working perfectly.
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Effectively, I think what happens is that when you turn off iCloud Photo Library, it leaves all the photos and videos on your phone in your local library. When you turn iCloud Photo Library back on, it has no idea which of the items in your local iPhone library are duplicates of items in your iCloud library, and so it has to check them one by one. Whatever algorithm it’s using for this is slow as molasses.
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So if you temporarily turn off iCloud Photo Library and turn it back on, it might be easier to just delete all your photos from your iPhone first, and let them all sync back from iCloud.
[…] Sometimes It’s Better to Just Start Over With iCloud Photo Library Syncing […]