Platforms like Telegram , WhatsApp , or TikTok often save videos with alphanumeric strings to keep their internal databases organized. If you manually moved a file from an app's hidden "cache" folder to your gallery, it would retain this random-looking name.

If it won't play, you can upload the file to a service like CheckFileType.com to confirm it is actually a video and not another file type disguised with an .mp4 extension.

If you don't remember downloading this file, do not open it . Randomly named files can occasionally be used to hide malware.

Some video downloader extensions or "save-from" websites rename files using unique hashes (like 0f71f09a... ) to prevent filename conflicts on their servers.

This indicates a duplicate download . Your operating system (Windows, Android, or macOS) automatically adds this if a file with the exact same name already exists in your "Downloads" folder. 🛠️ How to Handle the File

right before this file appeared? Knowing the source would help narrow down exactly what it is. How to Create and Open an MP4 File