I have workflow a step that outputs the following:

outputs:
  standard_bams:
    type: File[]
    outputSource: flatten_array_bams/output_bams

and a subsequent step that accepts this^ output:

inputs:
  standard_bam:
    type: File
    secondaryFiles: [^.bai]

I was wondering, is it only necessary to specify secondaryFiles in the inputs of the second step, and not in the outputs of the first step? (I assume this to be the case as that is what appears to be happening, but wanted to make sure).