Spine hierarchy missing elements?

[Wario]

This is my first time trying to import a model into VRChat, and I'm running into an issue that I cannot solve. I have found a model that I would like to use from Deviantart, and it seems to already have a bone structure set in place.



The first issue I had was that the right hand wasn't mapped. I changed the right hand to the end of the elbow, and that seemed to do the trick. Now, I am stuck wit the error: "Spine hierarchy missing elements, make sure that Pelvis, Spine, Chest, Neck, and Shoulders are mapped", even though Shoulders and Upper Chest are optional. Under bone mapping, I can't seem to figure out how to map a neck, so this may be my issue.



Here [imgur.com] are some screenshots of the model and the hierarchy of said model. I would really like to figure this out so I can import models to change whenever I want, instead of going to worlds each time I load into the game.



This is my first time using Blender and Unity, so go easy on me!

[No]

-you NEED shoulders, because otherwise unity doesn't know where to attach the upper arms. in your case i think they would be the "arm right/left shoulder 1"

-you NEED a neck, because otherwise unity doesn't know where to attach the head. it's usually named "head neck lower".

i can see those bones on your screenshot, so you shouldn't have problems with mapping them.

-upper chest is NOT ALLOWED when using a humanoid character like in your case, so don't bother with it. that's a limitation from the VRChat SDK