Delete photos from iPhone but they aren't deleting from iCloud

Hello mminten,

 When you use iCloud Photos and delete photos or videos on one device, it will be deleted on all other devices where you're signed in with the same Apple ID. However, if you're receiving a message that iCloud isn't syncing or backing up because there isn't enough storage, you may be able to delete the photos and videos on the iCloud website.

Please check out this link, which has more information on managing and deleting photos and videos on your device, and may help: Delete photos on your iPhone or iPad

Before you delete

Make sure that you back up the photos and videos that you still want. When you use iCloud Photos and delete a photo or video on one device, it gets deleted on all other devices where you're signed in with the same Apple ID. Learn how to delete photos and videos in iCloud Photos.

To see how much storage you have left on your device, go to Settings > General > [Device] Storage. Learn more about managing your device photo storage.

For information on how to manage your photos and videos on the iCloud website, please check out this link, which will guide you through that process: Delete and recover photos and videos on iCloud.com

Delete photos and videos

1. In Photos on iCloud.com, select the photos or videos you want to delete, or double-click a single photo or video.

2. Click , then click Delete.

Deleted photos and videos are moved to the Recently Deleted album.

3. To permanently delete photos or videos before they’re automatically deleted, go to the Recently Deleted album, select the items you want to delete, then click Delete [number] Items.

See also Delete photos or videos from your Shared Library.

For help on managing your iCloud storage, please also review the information from the following link, which offers some options that might be helpful: If you can't back up to iCloud

If an alert says that there's not enough iCloud storage

1. In iOS or iPadOS, go to Settings > [your name].

2. Tap iCloud. At the top, you can check how much iCloud storage you've used.

3. Tap Manage Account Storage or Manage Storage.

4. Tap Backups, then tap the device you're using. Under Last Backup and Backup Size, you can check  Next Backup Size. It may take a few minutes for your device to calculate Next Backup Size. 

5. If your backup needs more space than the amount you have available in iCloud, you can: 

• Delete information that you don't need to reduce the size of your backup

• Upgrade your iCloud+ plan to get more space

6. If you still need help, contact Apple Support.

Thanks!