Comment by lucabenazzi

Great job! I suggest that you go deeper into how the annotation feature works in the add-on description, as that could be potentially useful. My main issue with this solution is whether this file format is going to be reliable in the future. As with MHTML that was mentioned in another comment, formats that are not widely used may one day not be supported the same way they are today. Not sure how you've achieved this as clearly HTML cannot hold media file by itself (unless there's something I am not aware of), so it must do something at a file system level, so I wonder is it going to still work in future versions of the operative system?