To modify or respond to a message sent via SUCH, right-click (desktop) or long-press (mobile) on the message to access the context menu.
Here, you can choose to Reply, Edit, or Save as Quick Reply.
As a shortcut, you can also double-click a message to start replying, or use the Up Arrow key on your keyboard to start editing the last message you sent.
For text selection on mobile, long-press the message and then select the desired text.
To leave Reply or Edit mode, desktop users can use the Esc key.