How can I see what is stored in my iCloud
How can I see what is stored in my iCloud and how can I delete one by one what I don’t need to be stored in there I which could see what photos are in my iCloud
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On an iPhone or other iOS device, iCloud is designed to be viewed by using the apps on the device (e.g., the Files app for iCloud Drive, the Photos app for iCloud Photos, the Notes app for notes, etc.).
You can also use an internet browser on a computer and log into icloud.com.
Also note that while you can view synced data as described above, it is not possible to view the contents of an iCloud Backup. You can only use the backup to do a full restore of a device or to setup a new device.
The following may also help: Manage your iCloud storage - Apple Support
iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on or from iCloud will be deleted from iCloud and from all devices connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See: https://support.apple.com/en-us/HT204264