Photos app for Mac OS X and iOS device allows you to sync your photo library to iCloud. You can easily access and manage your photos even if you don't have an internet connection. You have 3 options to view your iCloud Photo Library photos while your are offline.
Download iCloud Photo Library Photos and Videos to your device: To view your iCloud Photo Library photos offline, you can download them to your iOS device or Mac. If you want to download all original iCloud Photo Library photos, then turn ON the "Download and Keep Originals" setting on your device. This will save every photo and video you have stored in iCloud Photo Library to your device. But for this, you need a large memory size.
If you want full-resolution photos and editing abilities, then download your photos before you go offline. You can use "Optimize iPhone Storage" setting to download full resolution copies of photos for viewing and editing when you are offline.
iCloud Photo Library stores small resolution thumbnails of all your photos on your device. It also caches and queues any changes you make to your iCloud Photo Library when you are offline. You can just view your photos those are not downloaded while offline. You can not view them at high resolution, edit them or share them, but you can view them, add them to albums or delete unwanted photos.
Quick Tip to ensure your Photos never go missing
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