PS4: copy/paste text in messages

The PS3 allowed the ability to copy/paste text when composing or replying to messages.

Where is this function on the PS4?

In the on-screen keyboard, there should be a "..." button right below the space bar. Press that, then hit "Select" to start selecting the text you want to copy. Once you've finished selecting the text (using D-pad or thumbstick), press the X button to finish. Select "Copy" from the prompt that appears, and your text will now be copied. To paste text, use the same "..." button below the spacebar, then select "Paste" from the menu that appears.

The method mentioned above only works for text in an editable textbox, however. Only the PS Messages mobile app seems to allow copying/pasting text of a message that was already sent.