WEB API Firebase Storage It does not upload the file to the server

Questions about Thunkable Web API's
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4

Hello @whiterabbitstudio202
I’ve already created an app that uses the API Block to send an image file.
I used Web Viewer and HTML code to convert the image file to base64 and then send it through the API.

This is the code for HTML:

<!DOCTYPE html>
<html>
<body style="background-color:#18A2EB;">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Convert local file to Base64</title>
    <script 
    src="https://thunkable.github.io/webviewer-extension/thunkableWebviewerExtension.js"
    type="text/javascript"></script>
    <style>
      .choose::-webkit-file-upload-button {
        color: white;
        display: inline-block;
        background: #1CB6E0;
        border: none;
        padding: 7px 15px;
        font-weight: 700;
        border-radius: 3px;
        white-space: nowrap;
        cursor: pointer;
        font-size: 10pt;
      }
    </style>
  </head>
  <body>
    <input type="file" accept="image/*" class="choose" onchange="encodeImageFileAsURL(this)" />
    <script>
      function encodeImageFileAsURL(element) {
        let file = element.files[0];
        let reader = new FileReader();
        reader.onloadend = function() {
          ThunkableWebviewerExtension.postMessage(reader.result);
          document.write('RESULT: ', reader.result);
        }
        reader.readAsDataURL(file);
      }
    </script>
  </body>
</html>

You can find the project here