multiple file uploads with angularJS and PHP

I am trying to learn angularJS by reading some tutorials, at this stage i'm trying to create a form with multiple upload files (2 separate ones). I thought of using the ng-file-upload plugin.

I'm stuck with the below problems,

1) How can i pass values from 2 separate file uploads?

<input type="file" name="profile_pic" ng-file-select="onFileSelect">
<input type="file" name="document" ng-file-select="onFileSelect2">

2) How do i capture the files separately into a PHP file?

HTML

<form enctype="multipart/form-data" method="post" >
 <input type="text" ng-model="name">
 <input type="text" ng-model="age">
 <input type="text" ng-model="title"> 
 <input type="file" name="profile_pic" ng-file-select="onFileSelect">
 <input type="file" name="document" ng-file-select="onFileSelect2">
 <input type='button' ng-click='onFormSubmit' value='Submit'>
</form>

Javascript

angular.module('myApp', ['ngFileUpload']);

var MyCtrl = [ '$scope', 'Upload', function($scope, Upload) {
  $scope.onFileSelect = function(file) {

Upload.upload({
    url: 'api/upload-data.php', 
    method: 'POST',
    file: file,
    data: {
        'name': $scope.name,
        'age' : $scope.age ,
        'title' : $scope.title ,


    }
})

  };
}];

PHP

 //does not show the files
  var_dump($_FILES);
  $filename = $_FILES['file']['name'];
  move_uploaded_file( $_FILES['file']['tmp_name'] , '/uploads');

  //shows the input texts
  var_dump($_POST)