To delete an attachment,
When deleting an attachment, the actual document that you are referring to is not deleted. You are removing its linked reference from Network Configuration Manager.
First, select an attachment from the listing of attachments.
On the Attachments tab, click the Deleteicon. The Confirm dialog window opens asking, "Are you sure?".
To delete, click Yes.
Click OK. The Confirm window closes.
The Attachment tab refreshes.