How can i delete data in the cloud that i do not want?

Declan-2020 Said:

"How can i delete data from the cloud i do not need?"

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Use a Computer for this:

Manage the iCloud storage through use of a computer, as it would be more user-friendly doing so. Viewing the iCloud Drive: https://www.icloud.com/iclouddrive

Delete it at iCloud.com or on any device on which iCloud is enabled. When you delete in one place, it deletes in all.

See the article Manage your iCloud storage - Apple Support