I've created my own G3 character using Affinity Designer - based it off of one of the pre-existing characters and followed the hierarchy of folders and pivot positions.  
When I bring it in and check the bone structure, everything is yellow except the hip and head - those are greyed out.
The character still works, but the hip joint is solid with no pliability.  I'm not sure if this is because of my layer order or bone structure order in Affinity or what, but I'd love to hear ways I can fix this.

It means the bone does not control any sprite image. It might be out of the sprite image.




YouTube Tutorials Here