gvcf:
  class: File
  location: keep:3b34d300671c8dc8d1b2327f6ddab140+587/ERR1726424.g.vcf.gz 

reference:
  class: File
  location: keep:a3af04432df3d71d22f2fe8be549ba96+5974/hg38.fa

sample: ERR1726424