Since updating to ios8 I've started to love the share menu which now allows me to send stuff all over the place, for example directly to my todo apps. Am I blind, or does this button not exist in the mail app? Kinda sad that I can't find it in either Mail.app or Gmail.app
Not sure for Gmail app, as I don't use it. As for the Mail app, it should be on the bottom button bar.
There is no share in mail. The icons on the bottom are for Flag, Accounts, Trash, Forward/Reply and Compose.