How to upload multiple files without starting their upload parallely, I want to implement synchronous upload, when one file gets uploaded the next file starts uploading

app.component.ts

file: FileList; //populated on filechange
uploadURI: Array < String >; //populated after filechange
  
public Tus() {
     if (this.file.length > 0 && this.uploadURI.length > 0) {
         this.uploadService.tusUpload(this.file, this.uploadURI);
     }
 } else {
     alert('file length error');
   }
 }

upload.service.ts

import * as tus from 'tus-js-client';

tusUpload(file: FileList, uploadLink: Array < String > ) {
      for (let i = 0; i < file.length; i++) {
          const upload = new tus.Upload(file.item(i), {
              uploadUrl: uploadLink[i],
              retryDelays: [0, 1000, 3000, 5000],
              onError: function(error) {
                  console.log("Failed because: " + error)
              },
              onProgress: function(bytesUploaded, bytesTotal) {
                  let percentage = (bytesUploaded / bytesTotal * 100).toFixed(2)
                  console.log(bytesUploaded, bytesTotal, percentage + "%")
              },
              onSuccess: function() {
                  console.log("Download %s from %s", upload.file.name, upload.url)
              }
          })
          upload.start()
      }
  }