我构建了带有文件上载的自定义React/Gatsby多部分表单，我想将所有表单数据发送到WordPress端点，将文件上载到特定文件夹，并在WordPress后端显示所有数据。

这是我发送数据的方式：

const {
    stepOne,
    stepTwo,
  } = useContext(FormStepProvider)

  const steps = {
    stepOne: stepOne,
    stepTwo: stepTwo,
  }

  const postData = async () => {
    const formData = new FormData()

    formData.append("stepOne", JSON.stringify(stepOne))
    formData.append("stepTwo", stepTwo.file)

    await fetch("https://panel.domain.com/wp-json/test/v1/forms", {
      method: "POST",
      headers: {
        "Content-Type": "multipart/form-data",
      },

      body: formData,
    })
      .then(response => response)
      .then(result => {
        console.log("Success:", result)
      })
      .catch(error => {
        console.error("Error:", error)
      })
  }

  useEffect(() => {
    postData()
    console.log(steps)
  }, [])

这是我的端点：

add_action( \'rest_api_init\', function () {
  register_rest_route( \'test/v1\', \'forms\', array(
    \'methods\' => \'POST\',
    \'callback\' => \'get_formdata_function\',
    \'args\'     => array(),
  ) );
} );

function get_formdata_function(WP_REST_Request $request)
{
    $data = $request->get_body();
    print_r($data);
}