iCloud sharing and privacy
If I share my iCloud, can other people in my family see or access my files?
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By "share my iCloud" do you mean share an iCloud storage plan? If so, see the following from Share an iCloud storage plan with your family - Apple Support
When you share a storage plan, your photos and documents stay private and everyone keeps using their own accounts with iCloud—just like when you have your own storage plan. You simply share the space available in the iCloud storage plan with your family members, so you only have one plan to manage.