It's definitely convenient to be able to use your computer to send and receive messages. I understand your Mac software is up to date, the Message + app will be compatible with iOS 10.8 and newer. While in a message thread do you see the space at the bottom to enter text as well as a + button to the left to add attachments? This is the correct display. When you press the Enter key on the keyboard this will send your message in the app. Does this work for you?
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