Cash App suggests doing some things before and after you deposit a check. For example, you should make sure that the company has the most up-to-date information about how to reach you. They could send you an email or even a text message. But don't click on any links in them because scammers are trying to look like customer service.
When you use Cash App's Mobile Check Capture to send a check, you have to wait a few moments until the app tells you that the check was sent successfully. It's also a good idea to keep the paper check in a safe place. If Cash App doesn't tell you otherwise, you can throw away the check after two weeks.