I tried uploading a video file to CodeSandbox(It was an MP4 Windows Media Player) and I got the error, "The file is not displayed in the editor because it is either binary or uses an unsupported text encoding".
I clicked and dragged the file "Sas.mp4" and this happened:
I tried searching for this problem on Google and I got answers revolving around this specific error for VSCode and not CodeSandbox.