Where did you , and are you having a specific problem playing it ? Add an MP4 File as a Step - Guidde Help Center

You can right-click the file in File Explorer and select "Open with" to choose Windows Media Player or the Movies & TV app.

If the file won't open or play correctly, consider these steps:

Since this is a private file specific to a personal device or a specific shared link, there is no public "guide" for its content. However, 1. How to Open and Play the File

Simply double-click the file to open it in QuickTime Player .