title: Firebase Storage invalid argument on upload
body: <p>I keep getting an <code>Invalid argument in put at index 0: Expected Blob or File</code> error. The funny thing is the argument is totally a file...</p>
  
  <p>Here is the code:</p>
  
  <pre><code>var file = document.getElementById('cke_69_fileInput')
            .contentWindow.document.getElementById('cke_69_fileInput_input').files[0];
  
  var storageUrl = 'noticias/imagenes/';
  var storageRef = firebase.storage().ref(storageUrl + file.name);
  console.warn(file); // Watch Screenshot
  var uploadTask = storageRef.put(file);
  </code></pre>
  
  <p>Here's the screenshot of the actual file warn just before the error asking for a file...
  <a href="https://i.stack.imgur.com/sp9z6.png" rel="noreferrer"><img src="https://i.stack.imgur.com/sp9z6.png" alt="enter image description here"></a></p>