Photos in your System Photo Library are available in apps like iMovie, Pages, and Keynote. You can also sync them to iOS devices and view them on Apple TV. And if you want to use your own images as your desktop picture or screen saver, the images need to be in your System Photo Library before you can select them in System Preferences.

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Sep 27, 2016  A lot of Mac tutorials mention the Library folder, which is where your macOS applications store things like settings and caches. Some settings can only be changed by editing files in the Library. But the Library is hidden by default. Hold down the Alt (Option) key when using the Go menu. The user Library folder is listed below the current user's home directory. Note: After you open the Library folder, you can drag the Library icon from the top of that window to the Dock, sidebar, or toolbar to make it readily accessible.

If you have only one photo library, then it's the System Photo Library. Otherwise, the first photo library that you create or open in Photos will become the System Photo Library. If you have more than one library, you might need to designate a System Photo Library, so other apps can access the photos and videos you want them to use.

Follow these steps to designate a System Photo Library:

  1. Quit Photos.
  2. Hold down the Option key and open Photos. One of the photo libraries is already designated as YourLibraryName (System Photo Library).
  3. Choose the library you want to designate as the System Photo Library.
  4. After Photos opens the library, choose Photos > Preferences from the menu bar.
  5. Click the General tab.
  6. Click the Use as System Photo Library button.

If you open a second or different library in the Photos app, and you haven't designated it as the System Photo Library, other applications will use photos from the original System Photo Library. Hold down the Option key when you open Photos to see which library is set as the System Photo Library.

iCloud and the System Photo Library

You can use iCloud Photos, Shared Albums, and My Photo Stream only with the System Photo Library. If you choose a different library in Photos without designating it as the System Photo Library, the iCloud tab in Photos preferences is disabled:

If you designate a new library as the System Photo Library and then turn on iCloud Photos, the photos and videos in the new library will merge with those already in your iCloud Photos. If you want to keep the contents of your photo libraries separate, don’t turn on iCloud Photos for more than one library in Photos.

If you want your Mac's photos to wirelessly sync to all your other iOS devices and computers, you want to set up iCloud Photo Library: Apple's photo sync service lets you back up your images on all your devices, as well as access them — online or offline — on said devices. If you're willing to pay for the extra iCloud storage space, you can store an incredible amount of photos and videos, all accessible at the touch of a button or multi-touch screen.

Here's how to set it up on your Mac and get everything configured to your liking!

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How to set up iCloud Photo Library on your Mac

  1. Launch the Photos app on your Mac.
  2. Select the Photos menu in the upper left corner of your screen.
  3. Go to Preferences.
  4. Click on the iCloud tab.

    Source: iMore

  5. Check 'iCloud Photos.' This will begin uploading any and all images you have stored in the Photos app to iCloud.

    “Hi Tysa, I upgraded my old MacBook Pro to the OS 10.11 El Capitan, and now the iPhoto app won’t open. It says the version of iPhoto installed on my Mac is not compatible with the current OS X. And it asks me to download the latest version for free from the Mac App Store. Dec 02, 2018  I had the similar issue, after I reinstall (clean install) Mojave, the photo library in external hard drive could not open correctly, and option-cmd-open could not fix the library either. After I realize the permission maybe the issue, and fix it, the library is open without problem. Hope this helps. Mac os mojave iphoto library could not be opened on iphone. Mar 18, 2020  You might see an alert message when you first open Photos or migrate an existing iPhoto or Aperture library. To return to your main Photos library, quit Photos. Then open it again while holding the Option key, select your main library, and click Choose Library. Get help with the Photos app on your Mac. Question: On my old PowerPC G4 (or G5) Mac I found some old photos in iPhoto. Is it possible to copy the database and open it in the Photos.app on my new Mac that runs macOS 10.14 Mojave? Or do I have to import the photos as just photos and lose all additional info.

    Source: iMore

How to optimize your photo and video storage

If you routinely shoot 4K video or high-quality images on your iPhone, iPad, or DSLR, you may run out of storage space fast. (I have a 1TB iMac, but also have almost a terabyte of 4K video stored in iCloud — it gets unwieldy, fast!) This is especially true if you have a Mac laptop with limited hard drive space: It's nice to look at your iPhone's gorgeous Portrait mode photos, but not necessarily always practical to store all of them locally.

Thankfully, Apple offers an Optimize Storage option, which lets you store full-resolution photos and videos of only your most recently shot and accessed imagery; all older photos and videos are available to download via iCloud and are stored as low-resolution previews on your device to save space. You can switch between optimizing your Mac's photos storage or storing your full library locally: Here's how!

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Note: If you plan on using Optimize Storage, we suggest having at least one device that stores your entire library locally (usually a Mac with a large local or external hard drive), so you have multiple backups of your photographs and video.

  1. Launch the Photos app on your Mac.
  2. Click Photos in the App menu in the upper left corner of your screen.
  3. Select Preferences from the drop-down menu.

    Source: iMore

  4. Click the iCloud tab.
  5. Click Optimize Mac Storage.

    Source: iMore

Full-resolution versions of your photos and videos will be uploaded to iCloud.

How to share photos with iCloud Photo Library

Apple's photo service doesn't just provide online backups and sync for your images and video: The company also offers a free sharing service that allows you to send shared albums to friends and family (or create a publicly-shared website). Here's how to turn it on for your Mac.

Questions?

Let us know in the comments below.

Updated January 2020: Updated for macOS Catalina. Serenity Caldwell worked on a previous version of this post

iCloud Photo Library: The Ultimate Guide

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