With Gmail, the user will be now able to view attachments that are hosted by Google Drive which will save files directly.
For Gmail, it is already possible to include files stored in Google Drive when writing an email. Google will provide an update to allow previewing the message attachments stored in Drive (photos, videos, documents, spreadsheets, PDF).
It will be possible to download such files without leaving Gmail. With a click on one of the previews, a full screen view of the image or document will be displayed. In this new update for Gmail, "you can read, search for a particular phrase or even browse several attachments."
These innovations will be deployed next week to Gmail on your computer. Google also reveals that Google Drive has 120 million active users.