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On the right hand side of the window, click the link
The name of the link "RO03-255-3.jpg" is the name of the uploaded file.
Link selected attachment to a field number
Click on the button 
in the bottom right hand corner to open the selected attachment.To link the selected attachment to a field number, choose a field number from the drop down box
On the left side of the attachment dialog shows a breakdown of attachments in relation to each field number.