Receive Message Event Attachments

I have configured a start node that with a receive message trigger that essentially captured information from an email. I have configured all the proper fields but I the "Attachments" field does not seem to work. Documentation has not been particularly helpful in this case. 

I have a PV of type Integer that can also handle multiples and the following is mapped to that PV:

property(msg!properties, "Attachments", null)

When I send an email to the process using its UUID, it captures all the fields correctly except for the attachments. Is my configuration incorrect?

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