Follow along with the video below to see how to install our site as a web app on your home screen.
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Deleting them from Photos will remove them from the cloud too, so don't do that. Open up Photos and click on the hamburger menu (three horizontal lines in the upper left) and choose 'free up space'. This will remove the files from your phone that have been backed up and leave them in the cloud.
Choosing 'free up space' will delete the pictures from your device. You will still see them in Photos from cloud storage, but if you delete them there, it will remove them from the cloud as well and they'll be gone. If the goal is to make room on your phone, then the free up space option will do that.