If it's from a stranger, do not click on it . Delete the message and the file immediately.
It could be anything—a meme, a family video, or a screen-recorded video sent by a friend. ⚠️ Security Warning: Do Not Open if Suspicious received_8499270873447805.mp4
If it's a friend or family member, ask them via a different channel if they sent a video. If it's from a stranger, do not click on it