POST request with incorrect pdf file size

[wpplumber]

Using a Vue JS project with axios post request to camouflage shows incorrect file size on chrome devtools:

 file.downloadUrl = `${docUrl}/${file.filename}`;
      let fileID = '';
      try {
        const formData = new FormData();
        formData.append('file', file);
        const headers = {
          'Content-Type': 'multipart/form-data;',
          desc: file.desc,
        };
        const resp = await axios.post(apiUrl, formData,
          { headers });
        fileID = resp.data.ID;