PxrCryptomatte is supplied as a Sample Filter plugin. As such the output for Cryptomatte is stored as a separate EXR file from your beauty or denoise outputs. Please note an OpenEXR is required to store the values correctly. See here for how to attach sample filters and how to combine sample filters. 

Layers

...

• name

Image Added

• path

Image Added

• material

Image Added

• attribute
  • __objectid - groups geometry by OBJ nodes
    
    Image Added
    
    
  • cryptomatte OBJ parameter - groups geometry by RenderMan's spare cryptomatte parameter
    
    Image Added
  
  
  • user attrs via instanced/non-instanced - groups geometry by attributes on packed geometry
    
    Image Added