The ACF community forum gives you a chance to post topics and get help from fellow developers and the ACF support team. It is also possible to talk to our friendly support team through email by opening a new support ticket.
Regarding your question, it is possible to define some location rules for your gallery field with the help of ACF. In your use case, you can set the field to only appear for User type == logged in and another rule for the field to appear when user == admin.
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