Go to Settings > Storage Space > Cleaning (or Mobile Manager >; Clean up the storage), and after cleaning, "Optimize album storage space" will appear. Click "Go" to open "Optimize Storage Space" and save the original photos to the cloud. The mobile phone only keeps a small-sized version, and can perform operations including photo cleaning, video cleaning, application uninstallation, application slimming, document cleaning, cloud migration, etc., which is simple and quick.