A list of URLs from which users can embed H5P content. If none are specified, all URLs will remain as links and not be displayed as embedded H5P content.

'[id]' is a placeholder for the H5P content ID in the external source.
For example:

- H5P.com: https://[xxxxxx].h5p.com/content/[id]
- Wordpress: http://myserver/wp-admin/admin-ajax.php?action=h5p_embed&id=[id]