Hiya!

Just a short info on how to make your VRM model (or VRM model you got and have rights to edit!) work best!

Game has procedural functions that adjust the game to the uploaded model, but they can only do so much!

- root bone (first bone in armature's chain) should be at world origin (0,0,0) position - most games and models use this position - in simple terms root bone should be between character's feet directly below, and start at ground level, otherwise animations won't work properly and everything will be shifted!

- sitting will work best if hips bone starts at where the character would sit, similar to a real human skeleton,

- vrm 0.0 works best, some vrm 1.0 might not - especially those using constraints feature (WIP)

- if you want to use vrm 0.0 model and have a working surprised expression (used in special mixer minigame reactions) just add a custom expression named "surprised" to your model, the game will detect it! (it's a standard expression in vrm 1.0 but not 0.0)

But if you don't care about all this you can just check out the demo and upload your model and see if it works!

Have a nice one!