iCloud Photo Library, part of Apple's iCloud service, now gives you a more convenient way to organize and store all your photos and videos across all your devices. Make an edit on your iPhone, and it's automatically updated on your iPad. Not only that, iCloud Photo Library gives you the option to only keep storage optimized copies of your photos and videos if you choose in order to save storage space. For some people, that could mean a few gigabytes of extra storage. All you've got to do is change some settings!
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