Steps to repro:
As you can see, you are unable to paste into the message. A workaround is to press the "return" key again and then select the empty line ONE ABOVE the last line in the message. You can now press/hold on this line and paste your message.
BUG??
- Open iMessage
- Click on one of your conversations
- Copy some text from your conversation
- Type the letters "test" into the message section
- Press the "return" button (adding a new line to the message)
- Now try and paste the text you just copied onto this line (press/hold for options).
As you can see, you are unable to paste into the message. A workaround is to press the "return" key again and then select the empty line ONE ABOVE the last line in the message. You can now press/hold on this line and paste your message.
BUG??