Use Photos on iCloud.com on your iPhone
With Photos on iCloud.com, you can access photos and videos stored in iCloud Photos from anywhere.
Note: To view shared albums or photos stored in My Photo Stream, use the Photos app on your iPhone. See Use iCloud with Photos on your iPhone, iPad, or iPod touch.
What can you do in Photos on iCloud.com on your iPhone?
View photos and videos: View photos and videos stored on any device with iCloud Photos turned on.
Upload and download: Upload photos from your device to iCloud Photos. Download photos and videos from iCloud.com to your device. See Upload and download photos using iCloud.com.
If you’re using another feature on iCloud.com, you can switch to Photos by tapping the feature’s name in the top-left corner of the iCloud.com window.
If you don’t see Photos on iCloud.com, your account is limited to iCloud web-only features. To use Photos and other features on iCloud.com, set up iCloud on your iPhone, iPad, iPod touch, or Mac.