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"How do I send my company file/accountant's copy? (I'm use QB online)"
If you're using QuickBooks Online, invite Your Accountant. Your accountant will have access to QuickBooks so it’s easy for you to work together.
(Left Dashboard > My Accountant > Invite (send Accountant's email).
Refer to this article for more info:
Only on QuickBooks desktop, you send the company file/accountant's copy. In QB Online, there is no such thing.