It’s more of a feature request really. eM Client correctly notifies us that the dragged-in image (inadvertently deleted by me on Desktop) cannot be found, but proceeds to send the message anyway.
All that is required in that notification is:
Continue - Send message without attachment
Cancel - Do not send message
Consequently we can repair the message with the missing attachment forgoing the embarrassment of a double send with an apology.
Thanks. 