Asynchronous upload to s3 bucket

Hi all,

Requirement is to upload files in asychronously to s3. Instead of uploading all files at once, it has to be uploaded batchwise. For example: if the user is uploading 100 files, starting 10 files will be uploaded and will the display the uploaded and failed files list. similarly next 10 files will upload to s3.

for (let i = 0; i < filesNames.length; i++){
var dataItems = new FormData();
dataItems.append("fileName", filesNames[i]);
dataItems.append("jobID", jobID);
debugger;
$.ajax({
type: "POST",
url: getSignedUrl,
data: dataItems,
contentType: false,
cache: false,
processData: false,
timeout: 1200000,
success: function(data) {
fileUploadStatus = "Upload In Progress";
progressListDisplay(i, fileUploadStatus);
uploadAsset(data);
form.delay(500).removeClass(CSS_LOADING).addClass(CSS_SHARE_SUCCESS);
},
error: function() {
form.delay(500).removeClass(CSS_LOADING).addClass(CSS_SHARE_ERROR);
}
});

function uploadAsset(data) {
progressBar.style.display = "block";
var startUploadTime = new Date();
var endUploadTime;
var url = data.signedUrl;
$.ajax({
type: 'PUT',
async: true,
url: url,
data: fileList[i],
contentType: false,
cache: false,
processData: false,
timeout: 1200000,
success: function() {
totalUploadSuccessor(startUploadTime, endUploadTime, fileList[i].name, jobID, true);
form.delay(500).removeClass(CSS_LOADING).addClass(CSS_SHARE_SUCCESS);
},
error: function() {
endUploadTime = new Date();
fileUploadStatus = "Upload Failed";
totalUploadSuccessor(startUploadTime, endUploadTime, fileList[i].name, jobID, false);
form.delay(500).removeClass(CSS_LOADING).addClass(CSS_SHARE_SUCCESS);
changeUploadStatus(i, fileUploadStatus, startUploadTime, endUploadTime);
}
});
}

function totalUploadSuccessor(startUploadTime, endUploadTime, filename, jobID, message) {
fileCount++;
if (message) {
$.ajax({
type: 'POST',
async: true,
url: getUploadFinishUrl,
data: {
filename: filename,
jobID: jobID,
allUploadFinish: fileList.length === fileCount
},
cache: false,
timeout: 1200000,
success: function() {
endUploadTime = new Date();
fileUploadStatus = "Upload Successful";
form.delay(500).removeClass(CSS_LOADING).addClass(CSS_SHARE_SUCCESS);
changeUploadStatus(i, fileUploadStatus, startUploadTime, endUploadTime);
},
error: function() {
endUploadTime = new Date();
fileUploadStatus = "Upload Failed";
form.delay(500).removeClass(CSS_LOADING).addClass(CSS_SHARE_SUCCESS);
changeUploadStatus(i, fileUploadStatus, startUploadTime, endUploadTime);
}
});

In this code uploading all the files at once, has to be modified in such a way that upload should happen batchwise. 

Thank you.