To add a video for Henry Brinley Richards / Hob y Deri Dando (Wyt tin hoffi dyri derwydd, All the Day), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Henry Brinley Richards / Hob y Deri Dando (Wyt tin hoffi dyri derwydd, All the Day)