Google mail does it again, attaching

Google has just warned my heart :)

google did you mean to attach files?

When sending a Message, Google has just informed me that I forgot to actually attach the file I've written I would. this simple personal and assisting window has just changed my perspective on the whole feature of 'warning windows' that until now were mostly unhelpful barriers instead of an actual guide or helper. this means a lot to me and I'm sure a lot of email users around the world.
Thank you for being and don't be evil  :)