[MlMt] Attachments - Numbers File

[Zak McClellan]

I do not work with Numbers files that often, but needed to email one 
today (.numbers)
My usual file attachment methodology did not work.

I typically copy (Ctrl+C) and paste (Ctrl+V) the file from Finder.  I 
also tried the Attachments toolbar/icon between the header and body of 
the message as well as Shft+Command+A.  All of these actions returned:

https://www.dropbox.com/s/ssikedo2yi0gzt9/Screenshot%202015-02-11%2012.04.16.png?dl=0
"You cannot attach a folder to an email. You must compress it first, for 
example, using "Compress…" in the Finder."

Any ideas on a remedy?

-Zak

MacBookPro 8,2
10.9.5 (13F34)
MailMate 1.8 (4576)