Sharing Apple ID in one iCloud account
Can I I share two Apple IDs in iCloud storage?
iPad 2, iOS 9
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You need to set up Family Sharing between the 2 IDs to be able to share iCloud Storage. The data stored in iCloud is separate, so each ID can only see the data associated with the ID.
Family Sharing – share iCloud Storage
Family Sharing - Share an iCloud storage plan with your family