Hey @Nukclearwolf220! Welcome to the forums!
You can make a boolean variable, let’s say “bFlipbook”.
Then when “S” is pressed use “Set bFlipbook” and mark it True.
Hope that helps! 
Hey @Nukclearwolf220 !
Did you get it figured out? Let us know if you did, and if so, it’d be great if you would post the solution for future solution seekers!
Let us know if there’s anything else we can do to help!