Printing HP Printables using both sides of the paper

I would like to be able to take advantage of the printer capability to print on both sides of the paper.  When I'm printing from my computer, this is not a problem.  However, when I set up automatic delivery of an ePrint app (Comics, for example), the printing comes out on one side only. 

Does anyone know how to set up the HP Connected print center to use both sides of the paper?

--mgg4