"Show Quoted Text" whether on or off always results in the three dots showing which have to be pressed to show the hidden original email message.
I was talking about message view, not compose screen, that's what the setting applies to.
Your sent messages should now be showing all quoted / original text (now = build 778 above or newer).
Also, when you press the 3 dots to show the original text, the cursor lands in the blank line just above the hidden text but below the signature. The cursor needs to land at the top of the message above the signature.
There currently is a disagreement between several highly esteemed users of this fine app about this (where the cursor should go and whether it should go anywhere at all).
I believe the way it works right now (again, 778 and newer) is the best middle ground which serves two most common scenarios.
1 - if you just need to look something up, keeping the cursor essentially at the old position, where the "(...)" was, avoids excessive scrolling which might have moved the original now expanded text out of sight (esp. if your signature is "tall");
2 - if your intent with expanding the original message is to add "inline style" reply snippets, you'll have to re-position the cursor anyway so your reply snippets can go into the right places in the original message.