Specifying a file in a google bucket as a string input to a task in a wdl

Hi

Due to how data fields in a vcf were labeled I need to parse bam names in a vcf_parsing task, but I don't actually need (or want) the bams to be localized. I had expected that an input block like this:

task vcf_parser {
File vcf_file
String tumor_bam
String normal_bam
...

would pass the bam name to the wdl without cromwell trying to localize the bam, but tests on a google VM (outside of Firecloud) show that cromwell wants to localize the bams anyway. Is this expected behavior?

Chip