Hi there, I don't use Aseprite, but you should be able to easily just import the png spritesheets into asesprite and then edit it from there. The frames are all 40 x 40.Here is a guide on how to import spritesheets into Aseprite, hope this helps!
https://www.aseprite.org/docs/sprite-sheet/
Thank you so much, this solves my problem
