Mutliple file upload

<input type="file" multiple accept="image/*" class="btn btn-file" id="fileToUpload" name="file_name" multiple required/>

PURE Jquery Code:
$(document).on('change','.btn-file',function(){
var fd = new FormData();
var ins = document.getElementById('fileToUpload').files.length;
for (var x = 0; x < ins; x++) {
fd.append("fileToUpload[]", document.getElementById('fileToUpload').files[x]);
}
fd.append("user_id", $scope.user_id);

$.ajax({
                  url: website,
                    data: data,
                   cache: false,
                  contentType: false,
                   processData: false,
                   type: 'POST',
                 success: function(response) {
                         
                         if (response.error_code == "SUCCESS") {
                                 alert("uploaded successfully");
                       }
    }
      });
});


Angular JS Code with Jquery file upload: 

$(document).on('change','.btn-file',function(){
var fd = new FormData();
var ins = document.getElementById('fileToUpload').files.length;
for (var x = 0; x < ins; x++) {
fd.append("fileToUpload[]", document.getElementById('fileToUpload').files[x]);
}
fd.append("user_id", $scope.user_id);

var fileConfig = {
transformRequest: angular.identity,
headers : {
//'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8;',
'Content-Type': undefined,
'X-Requested-With' : 'XMLHttpRequest',
'Process-Data': false
}
}

$http.post(baseurl + '/api_v3/healthcare_provider_photo_gallery/add', fd, fileConfig).
then(function(response){
   if (response.error_code == "SUCCESS") {
                                                alert("uploaded successfully");
                                           }
});
});