Here’s how to use Optimized Storage on a Mac:

  1. Click the Apple logo in the top left-hand corner of the screen.
  2. Click “About This Mac.”
  3. Click Storage.
  4. Click Details. Or Manage, if you’re on High Sierra.
  5. You’ll be presented with four options:

Moving older photos and videos to iCloudRemoving TV shows and movies you’ve watched (you can always redownload them)Deleting your trash automaticallyReviewing and deleting files individually 

  1. Select your option.
  2. Confirm your option. The rest will happen automatically.

macOS High Sierra Tips

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How to Download and Install macOS High SierraHow to Use Picture-in-Picture on a MacHow to Use Siri on Your MacHow to Use Optimized Storage in macOS SierraHow to Use Memories in the Photos App on MacHow to Use Messages in macOS SierraHow to Use Apple Pay in macOS SierraHow to Unlock a MacBook with Your Apple Watch