Do photos stay on iCloud if deleted from iPhone?
When you delete a photo or video from the Photos app on your iPhone, iPad, iPod touch, or Mac, it also deletes from your iCloud Photos and any other devices where you're signed in to iCloud Photos.
Can you delete photos off your phone and keep them on iCloud?
Can you delete pictures off iPhone and keep them on iCloud? Yes, you can!
How do I keep photos on iCloud only?
Store your photos and videos in iCloud.
Tap Settings > [your name] > iCloud > Photos..
Turn on iCloud Photos..
Select Optimize iPhone Storage to save space on your device..