app/assets/javascripts/slices/app/views/attachment_composer_view.js in slices-1.0.3 vs app/assets/javascripts/slices/app/views/attachment_composer_view.js in slices-1.0.4

@@ -300,10 +300,10 @@
   receiveAssets: function(assets, x, y) {
     var p = this.findPlacementPoint(x, y),
         position = p ? p.index : this.collection.length;
 
     _.each(assets, function(asset) {
-      if (this.alreadyContains(asset)) return;
+      if (!this.options.allowDupes && this.alreadyContains(asset)) return;
       this.collection.add({ asset: asset, asset_id: asset.get('id') }, { at: position });
       position += 1;
     }, this);
   },