Due your answer I was editing my previous one … How to select is described above
I had an issue to pick matte in Davinci (Fusion9 was fine) and found this report already from 2018 …
Cryptomatte can’t read metadata from DaVinci’s “MediaIn” node.
So … to be able to use Cryptomatte you have to use Loader node …
Also here is another Cryptomatte topic … because this matte system is not self-safe … a lot of ugly pixels on edges … in Fusion I found great node unMerge (for download post bellow in that link, drag&drop into node window) that worked as magic in that case.
