Thank you very much! Very helpful and useful!... And for all Mac users out there I wanna add one thing regarding the Add Animation action (on 5:44), cause it works differently on Mac (and I'm also using the latest PowerPoint version for 2021)... So after animating once, simply click outside the shape and return and click the shape again, then all future animation you choose next will be additive. Enjoy! 🍎💻
Couple of pts if you're running PPT with a Mac. For the first animation make sure that the backside card (El Perro) has its Triggers (On click) set to the facing card (here, it's "Dog"). Then in the Timing box above set its Start to 'after previous." That completes the first animation. To initiate additional animation do as Eran Darki has posted - click the outside part of the box and reverse the process - backside card (collapse) and frontside card (stretch), and this time the frontside card's Triggers is set to the backing card.