0 bytes when uploading PDF through API

I am using Webflow and Wized to upload a file to Dropbox however when I upload the file the response says size 0 and in dropbox it says 0 bytes and I can't open it. 

    const contentToCapture = document.querySelector('.pdf-content');

    html2canvas(contentToCapture, { scale: 0.75 }).then((canvas) => {
        const base64image = canvas.toDataURL('image/png');
        const pdf = new jsPDF('p', 'px', [canvas.width, canvas.height]);
        pdf.addImage(base64image, 'PNG', 0, 0, canvas.width, canvas.height);

        const pdfBlob = pdf.output('blob');
        v.pdf_data = pdfBlob;
    });

Above is how I create the pdf and convert it to a blob. The pdf itself works fine when I download it. 

This is how the request is set up.