"With today's update to Gmail, (...) you can view attachments and save files directly to Google Drive without ever leaving Gmail, making it easy to access them later from whatever device you're on - computer, phone or tablet. The next time you open an email with attachments, you'll see new previews of the files at the bottom of the email, from photos and videos to spreadsheets and PDFs."
Gmail now shows thumbnails for many file formats. Mouse over an attachment to download it or save it to Google Drive.
Gmail shows a list of Google Drive folders, so you can save the file to the right folder directly from Gmail. You can also download all the attachments or save all of them to Google Drive.
Click the attachments to preview files inline using Google Drive. The nice thing is that Google Drive Preview opens inside Gmail.
"This new attachment experience is available on desktop and will be rolling out over the next week," informs Google, which also mentions that Google Drive has 120 million active users.
{ via Gmail's blog }