Mac Not Syncing With Icloud Photo Library
I've had a multi-Mac household pretty much since college, rocking a laptop and desktop in addition to miscellaneous iOS devices throughout the years. Dropbox and iCloud sync made most of the pains of using several Macs disappear, but iPhoto was always a problem. My laptop is tiny! My iPhoto library, not so much.
Thankfully, Photos for Mac — paired with iCloud Photo Library's Optimize Storage feature — makes working with and syncing multiple Macs a breeze. Here's how you can do it.
How to use Photos and iCloud Photo Library with multiple Macs
Here's a quick, simple breakdown on setting up your Macs to support Photos and iCloud Photo Library.
In the Finder on your Mac, select the device in the Finder sidebar. Select Photos in the button bar. Note: When iCloud Photos is turned on, no photo syncing options appear when you select Photos in the button bar. Select “Sync Photos to your device from” checkbox, then choose Photos, Pictures, or a folder from the pop-up menu. Mar 03, 2020 On your Mac, open the Photos app. Select Photos in the sidebar, then click All Photos in the list of tabs in the toolbar. Scroll to the bottom of your photos and click Pause. Rediscover favorite and forgotten occasions from your photo library with Memories. Get help with iCloud Photos. Nov 09, 2019 WHen I upgraded to Catalina, I was able to migrate my old photo library (with some work), but syncing with iCloud did not work. Mac Photo seemed forever stuck on downlading. My solution was to create a new system library. As soon as I did this. ICloud Photos immedately began to sync with photos on my iPad and iPhone. Apr 01, 2020 Follow these steps to designate a System Photo Library: Quit Photos. Hold down the Option key and open Photos. One of the photo libraries is already designated as YourLibraryName (System Photo Library). Choose the library you want to designate as the System Photo Library. After Photos opens the. Sometimes, all it takes to fix the iCloud Photo Library not syncing issue is a simple reset. Go to your phone’s Settings iCloud Photos and turn off the option of “iCloud Photo Library”. Restart your device and follow the same drill. Though, this time you have to turn on the option instead.
I recommend starting with your biggest iPhoto library; it'll usually be on your desktop Mac. When you open Photos for the first time, your library should import automatically; if it prompts you to create a new library, your Photos library may be stored in another location on your Mac, and you may need to manually open it.
Mac Not Syncing With Icloud Photo Library Vs Photo Stream
Once you've imported your biggest library on your Mac, make sure iCloud Photo Library is turned on and syncing. You can do this by following these steps:
- Launch Photos on your Mac.
- Click Photos in the menu bar.
Select Preferences (or do this quicker by pressing ⌘,).
Source: iMore
Click on the iCloud tab.
Source: iMore
Check off the box for iCloud Photos.
- You can also check off the box for Download Originals to this Mac if you have the space.
- You can check off Optimize Mac Storage to save space on your Mac by only saving a percentage of images and video locally — the rest will be thumbnails that you can click on to download when you want to.
Source: iMore
Now, open your other Mac, and launch Photos. If you have an iPhoto library on that secondary Mac, follow the same steps as above — import your library, then turn on iCloud Photo Library. If you have duplicates of the same photo on each computer, iCloud should automatically resolve those conflicts when it syncs, providing you with just one version of your photos when the sync process finishes.

If you don't have an iPhoto library on your secondary Mac, create a new library in Photos and turn on iCloud Photo Library. If you want to save storage space on this secondary Mac, make sure Optimize Mac Storage is selected: This will save a certain percentage of images and video locally to your device, while providing thumbnails of all the others for you to download at your leisure.
After you've set up all your Macs with Photos and the sync process has finished, you're now good to go. From here on out, any time you add photos, they'll sync to every computer you've set up with Photos.
What syncs, what doesn't sync
Photos for Mac syncs a lot more than just your original photos and videos. According to a support document on Apple.com, here's what else you should expect to see sync:
- All folders and albums
- Smart Albums
- Keywords
- Memories
- Searchable keywords
- Key photo selections
There are a few things iCloud Photo Library won't sync, however. Here's Apple's list: How to open photos in lightroom from photo library mac pro.
- Books, cards, calendars, and slideshows
- Keyword shortcuts
- Unused keywords
- Last imported album on the Mac in question
- Names and faces in the People album
For those not using iCloud Photo Library

If you've chosen not to enable iCloud Photo Library, Apple still offers you free syncing of your last 1000 photos via My Photo Stream, which doesn't count toward your iCloud disk space.
This will sync and download images you've imported or taken on other devices, but you won't have the option to optimize your storage or sync your albums.
Octoober 2019: Updated for macOS Catalina.
Serenity Caldwell contributed to an earlier version of this guide.
macOS Catalina
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How it works
iCloud Photos automatically keeps every photo and video you take in iCloud, so you can access your library from any device, anytime you want. Any changes you make to your collection on one device change on your other devices too. Your photos and videos are organized into Years, Months, Days, and All Photos.And all of your Memories and People are updated everywhere. That way you can quickly find the moment, family member, or friend you're looking for.
Your collection uploads to iCloud each time your device connects to Wi-Fi and your battery is charged. When you have iOS 11 or later, your library can update over cellular too. Depending on your Internet speed, the time it takes for you to see your photos and videos on all of your devices and iCloud.com might vary.
Before you begin
- Update your iPhone, iPad, or iPod touch to the latest iOS or iPadOS, your Mac to the latest macOS, and your Apple TV to the latest tvOS.
- Set up iCloud on all of your devices.
- Make sure that you’re signed in to iCloud with the same Apple ID on all of your devices that you want to use with iCloud Photos.
- If you have a Windows PC, update to Windows 7 or later and download iCloud for Windows.
Turn on iCloud Photos
- On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iCloud > Photos, then turn on iCloud Photos.
- On your Mac, go to System Preferences > Apple ID. Click iCloud in the sidebar, then select Photos. If you have an earlier version of macOS, go to System Preferences > iCloud. Click Options next to Photos, then select iCloud Photos.
- On Apple TV 4K and Apple TV HD, go to Settings > Users and Accounts > iCloud. Then turn on iCloud Photos.
- On your Windows PC, follow these steps.
In earlier versions of iOS, macOS, tvOS, and iCloud for Windows, iCloud Photos was called iCloud Photo Library.
See your edits on all of your devices
When you make edits in the Photos app on your iOS or iPadOS device or on your Mac, the photo automatically updates across all your devices. So when you crop or enhance a photo from your iPhone, you see the changes when you access your library from your Mac. Your original photos and videos are stored in iCloud and you can go back to them at any time, and revert any changes you made.
The photos and videos that you delete on one device are deleted everywhere that you use iCloud Photos. Photos and videos stay in the Recently Deleted folder for 30 days before they're deleted permanently.
You can make edits on your iPhone, iPad, iPod touch, or Mac, and you’ll see them on your Apple TV automatically. Your entire collection is available on Apple TV, including your Memories and shared albums.
File types that you can use with iCloud Photos
Your photos and videos are stored in iCloud exactly as you took them. All of your images are held in their original formats at full resolution — HEIF, JPEG, RAW, PNG, GIF, TIFF, HEVC, and MP4 — as well as special formats you capture with your iPhone, like slo-mo, time-lapse, 4K videos, and Live Photos.
Back up your photos and videos
When you turn on iCloud Photos, your photos and videos automatically upload to iCloud. They're not duplicated in your iCloud backup, so you should keep backup copies of your library. You can download your photos and videos from iCloud.com to your computer and store them as a separate library, transfer them to another computer with Image Capture or Photos, or store them on a separate drive.
Icloud Photo Library On Mac Not Syncing
If you're on a device with iOS 11 or later or macOS High Sierra or later, the photos and videos you take are in HEIF and HEVC format. These formats use less storage, with the same quality.
Download your photos and videos
You can download a copy of your original photos or videos on iCloud.com, iOS, iPadOS, or Mac.
- On iCloud.com, click Photos, then select the photos and videos that you want to download. Click and hold the download button in the upper-right corner of the window. If you want to download your content as it was originally captured or imported, choose Unmodified Original. For JPEG or H.264 format — including edits, and even if it was orginally in HEIF or HEVC format — choose Most Compatible. Click download.
- On iOS and iPadOS, you can use AirDrop: in the Photos app, select some photos or videos. Tap the share button , then select the device that you want to share with. Learn more about using AirDrop.
- On Mac, select one or more photos. Drag the content to your desktop, or right-click and select Share > AirDrop.
Make sure that you have enough storage
The photos and videos that you keep in iCloud Photos use your iCloud storage and your device storage. And as long as you have enough space in iCloud and on your device, you can store as many photos and videos as you like.
When you sign up for iCloud, you automatically get 5GB of free storage. If you need more space, you can buy more iCloud storage. Plans start at 50GB for $0.99 (USD) a month. If you choose 200GB or 2TB plans, you can share your storage with family.
Learn more about plans and prices in your region.
Save space on your device
iCloud Photos keeps all your photos and videos in their original, high-resolution version. You can save space on your device when you turn on Optimize Storage.
On your iPhone, iPad, or iPod touch:
- Go to Settings > [your name] > iCloud.
- Tap Photos.
- Choose Optimize [device] Storage.
On your Mac:
- Open the Photos app and click Photos in the menu bar.
- Click Preferences.
- Go to the iCloud tab and choose a storage setting.
If you turn on Optimize Storage, iCloud Photos automatically manages the size of your library on your device. Your original photos and videos are stored in iCloud and space-saving versions are kept on your device. Your library is optimized only when you need space, starting with the photos and videos you access least. You can download the original photos and videos over Wi-Fi or cellular when you need them. You can use Optimize Storage on your iPhone, iPad, iPod touch, and Mac.
If you turn on Download Originals, iCloud Photos keeps your original, full-resolution photos and videos in iCloud and on your device.
Pause library uploads to iCloud
When you turn on iCloud Photos, the time it takes for your photos and videos to upload to iCloud depends on the size of your collection and your Internet speed. If you have a large collection of photos and videos, your upload might take more time than usual. You can see the status and pause the upload for one day.
- On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iCloud > Photos. You can also open the Photos app, go to the Photos tab, and scroll to the bottom of your screen.
- On your Mac, open the Photos app. Select Photos in the sidebar, then click All Photos in the list of tabs in the toolbar. Scroll to the bottom of your photos and click Pause.
Learn more
- Rediscover favorite and forgotten occasions from your photo library with Memories.
- Find your missing photos or delete the ones that you don't want anymore.