How to upload a file to Parse using the Official Parse PHP SDK

parse_file_upload.php

<?php
// define location of Parse PHP SDK, e.g. location in "Parse" folder
// Defaults to ./Parse/ folder. Add trailing slash
define( 'PARSE_SDK_DIR', './Parse/' );

// include Parse SDK autoloader
require_once( 'autoload.php' );

// Add the "use" declarations where you'll be using the classes
use Parse\ParseClient;
use Parse\ParseObject;
use Parse\ParseException;
use Parse\ParseFile;

// init Parse
ParseClient::initialize('xxx', 'yyy', 'zzz');

// see if we have a file
if ( isset( $_FILES['image'] ) ) {
  
  // save file to Parse
  $file = ParseFile::createFromData( file_get_contents( $_FILES['image']['tmp_name'] ), $_FILES['image']['name']  );
  $file->save();
  
  // save something to class TestObject
  $testObject = ParseObject::create( "TestObject" );
  $testObject->set( "foo", "bar" );
  // add the file we saved above
  $testObject->set( "image", $file );
  $testObject->save();
  
  // get the object ID
  echo 'Object Saved with ID: <strong>' . $testObject->getObjectId() . '</strong>.<br/>';
  // get the file URL
  echo 'File URL: <a href="' . $file->getURL() . '" target="_blank">' . $file->getURL() . '</a>';
} else {
?>

<form action="upload.php" method="post" enctype="multipart/form-data">
  Select image to upload:
  <input type="file" name="image">
  <input type="submit" value="Upload Image" name="submit">
</form>

<?php
}

how to upload mp3 file?
$file = ParseFile::createFromData( file_get_contents( $_FILES['mymusic']['tmp_name'] ), "newmusic.mp3");
$file->save();

I got this error
Warning: file_get_contents(): Filename cannot be empty
Fatal error: Uncaught exception 'Parse\ParseException' with message 'Cannot retrieve data for unsaved ParseFile.