Or, how to unlock submitted Exploration, send back to teacher, send Exploration back, unlock Exploration, send interim feedback
Sometimes users send Explorations to coaches that aren't quite finished, or, for whatever reason, need a little more work. Maybe the user forgot to attach a certain document, or didn't complete one of the components.
In such cases, coaches can send interim feedback to teachers and allow them to further edit their Exploration, including adding an additional video.
Inside the submitted Exploration, just click "Send interim feedback."

Coaches can also include a note when sending interim feedback, so that users know what to work on.
