Do not click on random "Download" links from unknown websites claiming to host this specific file. Since it is a private WhatsApp filename, any public download link is likely spam or malware .
If you have auto-backup enabled, the video may be stored in the cloud under the date October 9, 2019 . Download VID 20191009 WA0000 mp4
This specific filename is often used as a placeholder in technical tutorials or blog posts about "how to recover deleted WhatsApp videos." How to find the actual video: Do not click on random "Download" links from