@LeonidS Thanks, two questions:

1.In "post" module, replies do not have file attachment (unless it was just updated) in the "comments" to main post. If so, can you show me how to add it. (the image above is from the "discussion module".

2.Embeding works for videos already online (e.g., YouTube). But how about file that are on desktop or other locations.

Thank you so much for answering this.