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Now you can tap a photo attachment and use swipes to go to the next or previous image, just like in the built-in Photos app.
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The "print" link is no longer displayed next to the thumbnail, but it's still available in the actions menu. For some reason, filenames are no longer included.
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Another new feature: "when selecting a Google Drive file or Google+ link you'll now go directly to the app if it's installed. This can be turned off using the in-app settings."
{ via +Gmail }