Concurrent Upload of Large Files in JavaScript

uploadFile.js

async function uploadFile() {
  if (!uploadFileEle.files.length) return;
  const file = uploadFileEle.files[0];
  const fileMd5 = await calcFileMD5(file); // Calculate the MD5 of the file
  const fileStatus = await checkFileExist(
    // Check if the file already exists
    "/exists",
    file.name,
    fileMd5
  );
  if (fileStatus.data && fileStatus.data.isExists) {
    alert("File has been uploaded");
    return;
  } else {
    await upload({
      url: "/single",
      file,
      fileMd5,
      fileSize: file.size,
      chunkSize: 1 * 1024 * 1024,
      chunkIds: fileStatus.data.chunkIds,
      poolLimit: 3,
    });
  }
  const fileData = await concatFiles("/concatFiles", file.name, fileMd5);
  const {
    data: {
      data: { url },
    },
  } = fileData;
  alert(`Uploaded file url is: ${url}`);
}