[MlMt] Sharing a video from Photos.app to MM not working

[Eric Sharakan]

Hi, I tried to share a video (to attach to an email) from within 
Photos.app by right-clicking on the video and selecting Share->MailMate. 
  I got a dialog asking if I wanted to "create new mail with 
attachment", but when I click on the "create" button, nothing happens.  
The cancel button worked great though. :-(

I'm running MM r5626 on Mojave.

Thanks.

-Eric