Stop uploading photos to icloud

Unless the photos are appearing as thumbnails on your iOS device, then they are all already downloaded in their full resolution state. Just turn off iCloud Photo Library.

How do I turn off iCloud Photo Library on only one device?

You can turn off iCloud Photo Library on a single device when you follow these steps:

• On your iPhone, iPad, or iPod touch:
  • If you use iOS 10.3 or later, go to Settings > [your name] > iCloud > Photos, then turn off iCloud Photo Library.
  • If you use iOS 10.2 or earlier, go to Settings > iCloud > Photos and turn off iCloud Photo Library.
• On your Mac, go to System Preferences > iCloud > Options next to Photos, then deselect iCloud Photo Library.
• On your Apple TV 4K or Apple TV (4th generation), go to Settings > Accounts > iCloud. Under Photos, press Select to turn off iCloud Photo Library.

If you have Optimize Storage turned on, you might not have all of your original photos and videos on your device. To download the original photos and videos on your iOS device, go to Settings > [your name] > iCloud > Photos and select Download and Keep Originals. On your Mac, open Photos, choose Photos > Preferences, then select Download Originals to this Mac. Then you can turn off iCloud Photo Library. You can also select the photos and videos that you want to download from iCloud.com.

Before you turn off iCloud Photo Library, you might want to make a copy of your photos and videos.

Cheers,

GB

See -- Delete Photos Just Off iPhone, Not iCloud.