As one can see at discussion, the more plugin doesn't work --- it renders as:

<p><a name="more"></a></p>

<p>This is the rest of my post. Not intended for people catching up on
their blogs at 30,000 feet. Because I like to make things
difficult.</p>

No way to toggle visibility. -- Ivan Z.

More is not about toggling visibility. Perhaps you want toggle More is about displaying the whole page content when it's a standalone page, and only displaying a fragment when it's inlined into a blog. --Joey done

I see, thanks for bothering with the reply, I didn't understand this. --Ivan Z.