No. What you can do is to upload a document in the Vault (you might want to create a separate Q&A folder) and add the document as an answer reference in the Q&A dialog.
Can I upload a document in the Q&A as attachment to my answer?
No. What you can do is to upload a document in the Vault (you might want to create a separate Q&A folder) and add the document as an answer reference in the Q&A dialog.