Applying one smart filter to multiple objects (not link)
I downloaded a photoshop mock up a template and I can't figure out how it's done. The document has 5 different shapes and different angles. But has a smart object in the document that is applied to all of them. I know a little about linked smart objects, but these objects are done internally in the document. I want to know how they were able to apply the one smart object to the multiple shapes because I want to add an additional smart object to replace the shape. See below for screenshot and you can download the file to see too. It just looks like the smart object is grouped but I don't know how the groups were able to create the transform for the smart object to fit the shape. Please help!

!http://https://www.dropbox.com/s/bapvbyx8zv5wk7z/falling-business%20cards-mockup.zip?dl=0
