how to resend a imessage containing URLs on IOS 12.4?
On a message, simply touch and press lightly while holding until Copy and More comes up at the bottom of the screen. Select More, then check the message(s) you want to resend and then in the lower right of the screen, tap the curved arrow. Fill in the To field and then send the new message.

Once you get used to the right touch pressure and holding it, this will become second nature for you.