Katixy Hi! Sorry, if I'm posting this in the wrong place. This is not bug but I don't know where else to post it.. There doesn't seem to be a documentation available for the new sequence (frame-by-frame) animation in JSON export format in Skins -> Attachment and Animations sections: http://esotericsoftware.com/spine-json-format. Will there be documentation for those?
Misaki Sorry for the confusion. We have officially released 4.1, but have not completed editing all documentation for the 4.1 features. If there is something specific you would like to know, please write your question here so that we can answer.