Processing multiple simultaneous uploads with Cordova - angularjs

Question

I want to upload 4 images from an ionic app to server side made using sails js.
An user can upload many images so before submit a form so I save all images in an array as its shown below
var cameraOptions = {
quality: 100,
destinationType: Camera.DestinationType.NATIVE_URI,
sourceType : Camera.PictureSourceType.CAMERA,
encodingType: Camera.EncodingType.JPEG,
targetWidth: 500,
targetHeight: 500,
popoverOptions: CameraPopoverOptions,
saveToPhotoAlbum: false,
allowEdit:true
};
var success = function(data){
$mdDialog.hide();
if(key==null)
{
compteurImage =compteurImage+1;
$scope.$apply(function () {
$scope.imgURI.push(data);
});
$scope.nombreImage=compteurImage;
}
else
{
$scope.$apply(function () {
$scope.imgURI[key]=data;
});
}
$rootScope.image=$scope.imgURI;
};
After having had all the images in an array, I loop on the array and I send each image to the server as shown below
for (var i = 0; i<$rootScope.image.length; i++) {
if (keepGoing) {
var options = new FileUploadOptions();
var params = {};
params.idArticle =response.article.idArticle;
var url=$rootScope.image[i].substr($rootScope.image[i].lastIndexOf('/') + 1);
options = {
fileKey: "file",
fileName:i+(url.split('?')[0]),
mimeType: "image/png",
idArticle: response.article.idArticle
};
options.params=params;
var failed = function (err) {
console.log(err);
keepGoing = false;
};
var success = function (result) {
count++;
if(count==$rootScope.image.length)
{
console.log("success");
}
};
var ft = new FileTransfer();
ft.upload($rootScope.image[i], Globals.urlServer + Globals.port + "/article/uploadImage", success, failed, options);
}
Server side the controller in charge of upload image is /article/uploadImage
uploadImage:function(req,res)
{
req.file('file')
.upload({ dirname: '../../assets/imagesArticle'},function (err, uploadedFiles) {
if (err) return res.serverError(err);
else {
var chemin = '';
var type = '';
uploadedFiles.forEach(function (file) {
chemin = require('path').basename(file.fd);
type = file.type;
Image.create({cheminImage:chemin, typeImage:type,article:req.body.idArticle}).exec(function(err,image){
if (err)
{
res.send({success:false});
}
if(image)
{
res.send({success:true});
}
})
});
}
});
},
My issue is if regardless how many pictures I upload, when I look image directory on server side, images are always identical and correspond to the last image of the images array. For example if I upload 3 differents images, on server side I get 3 identicals images whose correspond to the third or last image in array.
how can I fix it ?