You can proceed as you wish.
Yooz allows you to import documents already categorized but it also offers automatic detection of the type of document (invoice or credit note).
Note that if you import a credit note in the middle of several invoices by mistake, Yooz will inform you that the document type is wrong. In the same control logic aimed at increasing the reliability of financial data, know that Yooz provides automatic detection of duplicates.
You cannot integrate the same invoice or the same credit note twice.