Adding extra fields when uploading image with CollectionFS

I'm new to programming in Meteor, I have been the whole day trying to figure this out without any luck. I'm using collectionFS to upload an image, I want to give it my Meteor.userId(); so that only logged in users can see their own images I have the following code:

'change .myFileInput': function(event, template) {
  FS.Utility.eachFile(event, function(file) {
    Imagess.insert(file, function (err, fileObj) {
      if (err){
         // handle error
      } else {
         // handle success depending what you need to do
        var currentUserId = Meteor.userId();
        var imagesURL = {
          "profile.image": "/cfs/files/images/" + fileObj._id
        };
        Meteor.users.update(currentUserId, {$set: imagesURL});
      }
    });
 });
},

I tried doing this but it won't work, it says access denied:

'change .myFileInput': function(event, template) {
  FS.Utility.eachFile(event, function(file) {
    Imagess.insert(file, function (err, fileObj) {
      if (err){
         // handle error
      } else {
         // handle success depending what you need to do
        var currentUserId = Meteor.userId();
        var imagesURL = {
          "profile.image": "/cfs/files/images/" + fileObj._id
        };
        createdBy: currentUserId,
        Meteor.users.update(currentUserId, {$set: imagesURL});
      }
    });
 });
},

Any idea how can I get this done?

Thanks a lot!