This is where most conversions fail. GLB files rarely contain VRM-ready expressions (Joy, Angry, Sad, Fun, etc.). A "full" conversion requires you to map existing shape keys or create new ones.
VRM expects the model to face and +Y up . GLB files often come facing +X or +Y. convert glb to vrm full
Navigate to File > Export > VRM (.vrm) . This is where most conversions fail
: Enter the avatar’s name, author, and usage permissions (essential for the VRM standard). convert glb to vrm full
Best if you are already preparing an avatar for platforms like VRChat.