Many times with got some files on our Gmail inbox which we might want to save on our Drive folder. For this you might first need to download file and then save it to your Drive folder. But if you wanna Save file directly from your Gmail Inbox then you can use Gmail Attachment To DriveGoogle Chrome extension.
Once you install it on your Google Chrome then whenever you open any email on your Gmail inbox which has any attachment then you will get an option of Save To Drive.
Once you click on it another window will appear which confirms that your file is saved on your Google Docs or Drive account.