icloud storage
If my family is using family sharing, is our icloud storage accessible to one another?
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The storage plan is shareable but the data itself doesn't share when you share the storage. See: Share iCloud+ with your family - Apple Support including the following:
When you share an iCloud+ subscription, everyone in the family group uses their own account. That way your photos, documents, and other information stay private, even though you're sharing access to the service. You simply share the features and space available in iCloud+ with your family members, so you only have one plan to manage.
There are other options to share files and folders and selected photos and coming later this year is an option to share all photos. These options are available whether or not you share a storage plan. If you need more information, please reply with details about what you want to share.