Based on what you said it's hard to tell you what the problem is. We need more details about what is or is not happening when you attempt to add an attachment.
Are you using Xfinity Connect or an email client?
If a client which one? If Xfinity Connect which version-full or lite? To find out click Preferences. General icon. What does it say next to Version?
Is the Add Attachment grayed out? If not, what happens after you click it?
Anything else we need to know?
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