how does one access their icloud storage?

iCloud is not storage in the sense of something like DropBox. For the most part, you don't just move things to iCloud. You use iCloud by syncing data to it from other sources. It's also used for backing up iOS devices.

Start here:

iCloud User Guide - Apple Support

Simmydog Said:

"How does one access their ICloud Storage?"

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Accessing iCloud Drive:

Try this Link: https://www.icloud.com/iclouddrive