For example, with the new Confidential Mode, users can set an expiration date for messages or revoke access at any time. In addition, the recipients of the confidential message will have many options that could compromise their deactivation. As a result, they will not be able to transfer, copy, print or download the message.
However, those who have malicious programs on their computer can still copy or download your messages or attachments. To start using Confidential Mode, you need to open Gmail, click Dial, and at the bottom right of the window, tap Enable Confidential Mode.
You can also set an expiration date and an access code for a message or attachment that you send. If you choose “No SMS access code, “Those who use the Gmail app will be able to open your message/attachment directly, while those who do not have a Gmail account will receive a password via email.
Do not forget that there is an update server side. So do not look for an update in the Google Play Store, wait a few days for Google to make it available to all.