Asset Bank sanitizes HTML input for attributes by default to remove any potentially unsafe tags.
If you trust the users responsible for uploading and editing assets and would like to use HTML embed tags (or other blocked tags) in an HTML field you will need to disable the sanitization.
To do this...
- Login as an admin user
- Go to Admin > Attributes
- Click edit next to the Text Area attribute in question
- Untick 'Sanitize HTML' on the edit page
- Save the attribute