Not able to send files data from front-end (react.js) to back-end (node)

Question

I have an application that stores to its state files' content, whether images, audio or both, as shown here with the mediaAudio object key:

In my react.js code, I make my post as such:

   var bodyFormData = new FormData();
    bodyFormData.append('data', formData);

    axios({
      method: "post",
      url: 'http://localhost:5000/post-entry',
      data: bodyFormData,
      headers: { "Content-Type": "multipart/form-data" },
    })
    .then((response) => {
      console.log(response);
    })
    .catch((response) => {
      console.log(response);
    });

In my node.js code, I retrieve my data as such:

app.post('/post-entry', (req, res) => {
  let data = req.body.data;
  console.log(data);
});

However, I'm not able to get the data being logged, it returns undefined.

What is happening? Thanks