    let fileInput = document.getElementById('fileInput');
        let file = fileInput.files[0];
        console.log(file)
        let xhr = new XMLHttpRequest();
        xhr.open('POST', '/upload');
        let formData = new FormData();
        formData.append("file", file);
        xhr.onload = function() {
            if (xhr.status === 200) {
                let response = JSON.parse(xhr.responseText);
                UUID = response.data.uuid;
                upload.classList.add("hidden");
          