change of email address
If my email address is my user profile id and I change it, will my pictures still be there?
iPhone 8, iOS 13
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User profile ID is the same as your Apple ID?
If you do a name change on your existing ID, you should retain all data and all purchases. Note the restrictions in the article.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.