Maybe I don't understand how this is supposed to work.

What I want to do... is if someone has a quote in their reply, and I want quote that reply including the first quote, is to have the first quote and the reply quote both show in my reply.

So I go to the reply, check the multi-quote button, then reply with quote. Then it shows up in the quick reply. Then I hit POST QUICK REPLY and nothing shows up but the last quote.