Free templates: The .story vs .storytemplate templates


I am new to Storyline 2 and practicing on the free templates available. I would like to merge slides/scenes picked up from multiple templates.

I've noticed that a majority of free templates are the ".story" version which unlike the ".storytemplate" do not show/appear in the "Insert Slides" option tab while wanting to insert more new slides/templates. 

How do I ensure that the ".story" templates can be accessed from the "Insert Slides" option? 

Thanks in advance.

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