Have a look at th plugin below that may help with what you're after:
Edge Animate - Adobe Fireworks Extensions, Commands and Panels - johndunning.com
More information is available in this thread:
You can either imput several png images and then keys hide show to them
you can make a spritesheet in Animate CC (Flash) or any sprite making software and import it in EA and it will create the keyframes for you.
ok but it is too intricate