If you want to record from Snapchat, use the latest iOS to screen record. Swipe up and there will be a circular button. Press this and your screen will be recorded. This used to be a good way of screenshooting snapchat/telegram but they've since updated their apps to notify users if someone is recording.
https://www.cnet.com/how-to/how-to-u...rding-feature/
I'd do it myself tonight but I don't think I'll be in the right company to be recording naked runs...
Happy recording.