Google has come up with a way to circumvent email attachment size limitations while encouraging users to use Google Drive at the same time. Today marks the first day of being able to attach Google Drive files of up to 10GB to Gmail messages.
The option to add a file from Google Drive can be found right next to the paperclip symbol in the Gmail composition box. You can also copy and paste Google Drive links into an email to send the attachment. You won’t have to worry about long upload times because Google Drive files are saved to the cloud.
You should see this new option within the next few days.
Source [Gmail Blog]