Documents can be uploaded to a Person Record from the Attachments section. There is a document size limit of 10MB per document.
Uploading a document
In the CRM tab, open the Opportunity or Person record.
Select Attachments in the left hand panel.
3. Click Upload File - allows you to upload a file from your computer, or
4. Click Attach From Library - prompts you to select a document from your Mercury document templates.