Generate a custom link and use it in your own emails.
Share your file right from your Drive by using the menu "Open with" when you right click on file(s).
Your file remain secure in your Drive, no need to share them publicly with automatic expiration date up to 30 days
First time your contact open the link to download files you get an email notification.
You can keep track to know when your files are really downloaded.
In your dashboard for all transfers you can check :
During beta all options are free