Matt,

There should be one right next to the Gmail Send button. Try reloading your browser.

Let me know.

Thanks!

John,

The recipient receives a URL in place of the attachment. There is no indication otherwise that lets the recipient know that clicking on that link will alert the sender.

Furthermore, for emails with multiple recipients, each recipient gets a differently encoded link. The sender is notified specifically for each recipient.

Thanks for the questions!

Best!