Attachments to outgoing e-mails

When creating an outgoing e-mail, and if I have an attachment that I've attached to the e-mail, I am unable to open that attachment while working on the e-mail. Does anyone know if this is standard for the COX brand of internet, or do I need to make an adjustment somewhere to my settings. I don't have a problem with gmail, or any other e-mail accounts that I have had in the past. I am new to COX and frustrated with this. Any suggestions would be greatly appreciated.