alt Hacker NewsThanks, that was a relief because I realised I didn't see the sync status at the bottom. It appears that Monterey hides the status message at the bottom by default, and I had to pull the page down twice to see it.
Long story short, iCloud wasn't syncing photos "due to performance" and this message was hidden.
Thanks once again!
No worries! I don't understand why Apple is so averse to surfacing the status of things, especially highly sensitive and finicky things like online sync. It would dramatically improve the feel of the software if it didn't seem like it just inexplicably wasn't working half the time.
Happy to hear it helped. :)