Look at the folder where the file is saved. Folders named "Telegram Video" or "WhatsApp Video" confirm the app it came from.
If you are having trouble playing the video, use these standard methods:
Most smartphones play MP4 files natively in the Photos or Gallery app. ⚠️ Security Note 1_5170666846541578998.mp4
Use VLC Media Player if the standard player fails, as it supports almost all MP4 encoding types.
Malicious code can occasionally be hidden in the metadata of an MP4. Look at the folder where the file is saved
If you received this file from an unknown sender or a suspicious group, do not open it. Scan it with an antivirus program first. How Malicious MP4 Files Threaten Security and Reputation
If you cannot open the file or want to know what it contains without watching it, you can check these details: ⚠️ Security Note Use VLC Media Player if
Double-click the file to open it with Windows Media Player or QuickTime .