Chunk-Level Retry

Each chunk retries independently with exponential backoff on failure.

(function() {
    var logEl = document.getElementById('log');
    function log(m) { var d = document.createElement('div'); d.className='pkg-log-entry'; d.textContent=m; logEl.appendChild(d); logEl.scrollTop=logEl.scrollHeight; }
    new MultipleUpload('#demo', {
        uploadUrl: '/api/upload',
        multiple: true,
        chunked: true,
        chunkSize: '1MB',
        retries: 3,
        retryDelay: 1000,
        retryBackoff: 'exponential',
        onRetry: function(file, chunkIdx, attempt) {
            log('Retry chunk #' + chunkIdx + ' attempt ' + attempt + ' for ' + file.name);
        }
    });
})();