Downloading attachments in Gmail app

[Johnny.Bravo]

How do you download attachments on the Gmail app? There is no "download" button, only "Preview", and if its not a document that can be previewed all I get is an error message. For instance, if I download something to my PC, its easier to just email it to my Gmail account and then download it to my phone rather than dig out a USB cable or pull out the Sd card. But when I open the email in the Gmail app there is no way to save the attachment. I have to use the stock email app for that, and that means I get double notifications every time I get an email.