>>>When you attempt to reply (unnecessarily) a list of "File# N Choose File ..." fills up the space along with list of "forward this message to". At least the former was not there in old days. I would understand having just one "Choose File" but why 10 when you didn't even have 1 to attach. At least the buttons at the bottom (Send, ...) could be above them to prevent excess scrolling.
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>>When having a message form, you may use the right option of that area to collapse it.
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>It is cumbersome to do :( I wish it was reverse and collapsed by default (and still buttons are above).

Do that once and they stay so.