If OkiOki is offered to you by your accountant, then she/he will have real-time access to your data. They will automatically receive your documents and if they need more insight they can always consult OkiOki and check if you have left them any comments.
If you have bought your own OkiOki license, then you can still link OkiOki with your accountant and the accountancy software. You can do this by using your accountancy email address or via sFTP. For you to decide in accordance with your accountant. And if their software does not facilitate email addresses or sFTP then you can always download your document and send them to your accountant.