Steps to reproduce:

1. Go to anywhere with an Atto editor.
2. Click "Record video" or "Record audio" in the control buttons bar at the top of the editor.
3. Click "Start record", record a few seconds of audio/video, and then click "Stop recording."
4. Click "Record again", and repeat step 3.
5. Click "Attach recording".

Expected result:

• A single embedded audio/video appears in the editor, that will play the final version recorded

Actual result:

• Two embedded audio/videos appear in the editor (or as many times as you click “Record again”)

Notes:

1. This bug may not be present in Google Chrome on Ubuntu.
2. The multiple instances will both play the last audio/video file recorded.
3. There is still only one base file; however, it will have multiple database references.
4. This bug was present in the original Moodle plugin and was reproducible on prior versions of Moodle; it is not a result merely of being introduced to core