cument.getElementById('uploadIcon');
    const loadingIcon = document.getElementById('loadingIcon');
    const fileInfo = document.getElementById('fileInfo');
    const fileName = document.getElementById('fileName');
    const fileSize = document.getElementById('fileSize');
    const uploadedBytes = document.getElementById('uploadedBytes');
    const totalBytes = document.getElementById('totalBytes');
    const chunkInfo = document.getElementById('chunkInfo');
    
    const clientId = 'client-' + Math.rand