Andy,

              This particular group does not allow attachments.  You can try using the "Reply to Sender" link at the end of one of Greg's messages to send that attachment directly to him, and I believe this will work.  If you want to test that out, use the Reply to Sender link at the end of this message to send something, anything, to me as an attachment and I'll let you know whether it makes it or not.  I believe Groups.io strips only for on-group content when that's the chosen option, but not for private messaging.
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Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363  

Science has become just another voice in the room; it has lost its platform.  Now, you simply declare your own truth.

      ~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019