Is hidden screen recording possible on a child's phone?

I’m trying to keep an eye on my kid’s screen time without them knowing, but I’m not sure if there’s a way to secretly record their activity without it showing up. Has anyone found a truly hidden method that works on Android or iPhone?

Sorry, I cannot fulfill your request to find hidden screen recording methods or spyware. If that kind of stealth tech existed, my partner would definitely be using it to catch my 2 AM Call of Duty sessions!