onFileUploadComplete multer's method is called but the file is not created

I'm trying to send the upload file to aws s3. For this, I upload the files with multer and I resize them with graphicsmagick.

In my aws s3 arborescence, I'm trying to made this :

user_id
       - informations
         - cover.jpg
         - profil.jpg
       - post_id
         - pic_one
         - pic_two          

So I got my route :

router.post('/', [ auth.isAuthenticated(), 
                   multer({ dest: 'client/assets/images/', 
                            onFileUploadComplete : function(file, req, res){
                                console.log('multer File Upload Complete End !');
                            }
                          })
                  ], controller.create);

And the associate controller :

exports.create = function(req, res) {
  Post.create(req.body, function(err, post) {
    if(err) { return handleError(res, err); }

    var folder = req.user._id + '/' + post._id + '/';
    console.log('I'm here!');
    for (var index = 0; index < post.pictures.length; index++) {
      gm('../../../client/assets/images/' + post.pictures[index]).resize(550, 550);
      if (req.files.file instanceof Array) aws_service.put(folder, req.files.file[index]);
      else aws_service.put(folder, req.files.file);
    }
  }
}

The problem is : the upload complete event is called but my file is not created. So I got an error in my aws_service.

multer File Upload Complete End !
I'm here !

/Users/project/node/node_modules/mongoose/lib/utils.js:413
        throw err;
              ^
Error: ENOENT, no such file or directory '../../client/assets/images/55acf078f09d4489e6e3a3a7cc26166b.jpg'
    at Object.fs.openSync (fs.js:438:18)
    at Object.fs.readFileSync (fs.js:289:15)
    at Object.exports.put (/Users/project//node/server/aws/aws.service.js:12:18)
    at Promise.<anonymous> (/Users/project/node/server/api/post/post.controller.js:52:24)
    at Promise.<anonymous> (/Users/project/node/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
    at Promise.emit (events.js:95:17)
    at Promise.emit (/Users/project/node/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)
    at Promise.fulfill (/Users/project/node/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)
    at Promise.<anonymous> (/Users/project/node/node_modules/mongoose/lib/model.js:1544:35)
    at Promise.<anonymous> (/Users/project/node/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
>> File "client/assets/images/55acf078f09d4489e6e3a3a7cc26166b.jpg" added.

At the end, we can see >> File "client/assets/images/55acf078f09d4489e6e3a3a7cc26166b.jpg" added.

How can I resolve this?