Search for the filename specifically in your device's file manager app. 2. How to Play Mobile: Use your phone's default Gallery or Photos app.
Ensure the file has not been renamed or moved from its original folder.
Transfer the file to a PC/Mac and use a media player like VLC Media Player or the default Windows/QuickTime player. 3. How to Fix "File Not Found" or "Cannot Open"
Open the WhatsApp chat where the video was sent, tap the contact/group name, then check "Media, Links, and Docs".