Thank you so much for replying! Perhaps there are two issues. I am confused about the difference between a non-Wordpress user choosing to receive posts by e-mail (which I have done with my own blog to see what happens), and a WordPress member who just clicks the "follow" button.
When I was logged out, I signed up as an e-mail follower of my own blog. I DO receive the entire post by e-mail. Are you saying that even for an e-mail follower like me, in the case of an embedded video, I would not also receive the video? (I did receive the embedded audio file I created this week.)
And are you saying that, if I were a wordpress user who, when logged in, clicked the follow button on a blog, I would only receive an email saying that a new post is up? Thanks for your help.