Apple My Photo Stream has now been officially shut down today. For more information on this transition, please read Information about the My Photo Stream shutdown.
Moving forward, iCloud Photos is the best way to keep the photos and videos you take up to date across all your devices and safely stored in iCloud.
If you already have iCloud Photos enabled on all your devices, you do not need to do anything else — your photos are already stored in iCloud.
To check from your iPhone or iPad, go to Settings > your name > iCloud. On your Mac, choose > System Settings > your name > iCloud. From there, simply make sure that Photos is enabled in your iCloud Settings.
iCloud Photos can be enabled on iOS 8.3 or later, iPadOS 8.3 or later, and macOS 10 Yosemite or later. Once set up, you can view your photos and videos in the Photos app on your iPhone, iPad, Mac, Apple TV, Apple Watch, iCloud.com and even sync them to a Windows PC using iCloud for Windows.