Here's the way RPG Maker requires the formats. For other engines you can slice them based off this key guide. The idle animations are designed to loop in frame order 1-2-3-2-1. Not in 1-2-3-1-2-3. This will give clean 5 frame loop animation.
Thanks mate! Much appreciated! Does 1-2-3-2-1 apply to some of the other animations to?
anything you want to loop or that acts as a non attack or action yes.