I am trying to send a buffered video to save it as a file on my server.
Always the file is empty.

My js get the url "blob:https://..." and sends to the php that receive it.

```
$file = file_get_contents(url);
file_put_contents($video_url_mp4."helloWorld.webm",$file);

```

I tried send the video as canvas and i only get one frame.
suggest please