Enable the effect of iCloud Photo Gallery.

After you enable iCloud Photo Gallery, your photos will be automatically uploaded at the highest resolution. Every edit you make is automatically updated to each device. ICloud Photo Gallery can also replace photos on your device with smaller sizes to help you optimize the space on your device. On iOS? 1 1 and macOS high? In Sierra, a new generation of compression technology allows you to store twice as many photos in iCloud as before. The iCloud photo * * * sharing function makes it easy for you to show the photos and videos you want to enjoy to the people you want to share.

How to completely delete photos in Apple iCloud photo stream?

① Log in to Apple's official iCloud website (click to enter) and enter the Apple ID account and password.

② Then click on your account name in the upper right corner. The Account pop-up window appears, and then click Advanced → Reset photo stream.

③ The reset photo stream pop-up window appears. Click the reset account confirmation pop-up window, enter the password corresponding to the Apple ID account, and then click the button.