Final answer:
To automatically move attachments from an HR case into the Document repository, you need to select the Automatically Move Attachment box on the Retention policy, the Document type, and the HR Service.
Step-by-step explanation:
To automatically move attachments from an HR case into the Document repository, you need to select the Automatically Move Attachment box on the Retention policy, the Document type, and the HR Service. By enabling this feature in all three areas, any attachment associated with an HR case will be automatically moved to the Document repository.