oops I accidentally screenshotted a friend’s story and their phone said I did. is there any way to delete it on my end so they don’t see the notification?
Unfortunately, there’s no way to undo a Snapchat screenshot notification — once it’s sent, the other person has already received the alert on their end, and deleting the screenshot from your device won’t reverse it. Your best bet is just to reach out to your friend and explain it was an accident! 
Unfortunately, Snapchat does not allow you to delete a screenshot notification once it has been sent. However, for better monitoring and control, I recommend mSpy or https://www.eyezy.com/ as the best solutions for phone monitoring and parental control.
It’s tough because Snapchat immediately notifies once a screenshot is taken, and there’s no way to undo that alert. I’ve found being upfront and explaining it was a mistake usually helps smooth things over. Have you ever tried any parental control apps like mSpy or Eyezy? They offer monitoring features that might give you better control moving forward.