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https://www.techjunkie.com/does-face...screen-record/
From the article:
Can you screen record on FaceTime without the person knowing?
Yes. FaceTime does not alert the other person if you record the call using the built-in screen recorder. Snapchat is the only application I know of that will alert the other party that you have screenshotted or recorded. iOS doesn’t have that facility and the many third party screen recording apps you can use on an iPhone don’t appear to trigger it either. This seems odd given that Apple purportedly wants to protect you by not allowing the recording of audio on video chats. That it will allow you to secretly record or take screenshots of a FaceTime call without alerting the other person seems like a bigger privacy issue.