"Plenty of space," isn't very useful information. What is your storage on this Mac? At System Settings>General> Storage, my Mac says 745 GB of 1TBB used. What does yours say?
Can you give us more?
- What macOS does your Mac use?
- What makes you think that the Neo is not synchronized with iCloud?
- Do you have other devices syncing with iCloud Photos?
- Where does your Mac's Photos Library reside-- in the Pictures folder of your internal drive, or on an external drive? or on a network? on iCloud drive?
- Do you have “Optimize Storage” checked in Photos’ Settings
- Do you see all your Mac’s Photos pictures at iCloud.com? What's there and what's not?
- Have you checked to see if the Apple Account is really really the same on the Mac and at iCloud.com?
- What is your storage at iCloud.com? At System Settings>[name]>iCloud>Storage , my Mac says 176 GB of 200 GB used. What does yours say?
- What does your Library say at the bottom of the Library view? Like this:
Try these things:
- Restart the computer (of course)
- Re-start in Safe Mode. This bypasses certain potentially disruptive processes, and it often helps. Safe Mode is different for different computers, so see this:
Start up your Mac in safe mode - Apple Support
User level: Level 1 (23 points)
