[MlMt] Copy or drag 'n drop an attachment from one Compose window to another Compose window?

[leo]

Hi there

How can I copy or drag 'n drop an attachment from one Compose window to 
another Compose window?

To be clear: I have the attachment to copy *not* in a window of a sent 
email , but in a window composing a new email. (A Compose window is what 
you get when you use MailMate’s share extension from another 
application.)

Thanks,
Leo
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