Step 1.
Select a comment type to place on the Proof.

Step 2.
Enter your comment text.

Step 3.
Click the Add Attachments button

Step 4.
Drag your file onto the add attachment area, or click Browse To File to choose your attachment.

Step 5.
Once your attachments have uploaded, click Save.

Step 6.
To confirm that your attachment has been added successfully, check the comments tab for an orange paperclip icon next to your added comment.