I seen it earlier, but I just assumed it was something about using your mic to record an email.... I wasn't really paying attention. It told you about the feat

I seen it earlier, but I just assumed it was something about using your mic to record an email.... I wasn't really paying attention. It told you about the feature in a pop up ( I think) when you went to compose a new email and the button was there next to the send button when composing.