Use iCloud Photos on iPhone
You can use iCloud Photos to keep the photos and videos in your Photos app securely stored in iCloud, and in sync on your iPhone, iPad, Mac, Apple TV, and Windows computer. You can also access your iCloud photos and videos in a web browser. The photos and videos you take are uploaded automatically and stored in their original format at full resolution. Any changes you make to your Photos collection on one device are reflected on your other devices too.
To use iCloud Photos, make sure that you sign in with the same Apple ID on all devices and that your devices meet these minimum system requirements: iOS 8.3, iPadOS 13.1, macOS 10.10.3, or a PC with iCloud for Windows 7.x.
Turn on iCloud Photos
Tap Settings
, then tap [your name].
Tap iCloud.
Tap Photos, then turn on Sync this iPhone.
Save space on your iPhone
iCloud Photos can help you make the most of the storage space on your iPhone. When Optimize iPhone Storage is turned on, all your full‑resolution photos and videos are stored in iCloud in their original formats, with storage-saving versions kept on your iPhone as space is needed.
Optimize iPhone Storage is turned on by default. To turn it off, go to Settings > [your name] > iCloud > Photos, then tap Optimize iPhone Storage.
Get more iCloud storage
If your uploaded photos and videos exceed your storage plan, you can upgrade to iCloud+ for more storage and additional features. See Subscribe to iCloud+ on iPhone.