We tried using BOX relay to see if we can drop a file in a master folder, and copy it from mirrored folders, or delete from mirrored folders when deleted / moved from the master folder.  But once you trigger a workflow you lose any connection to that file for future workflows.

A feature request would be to get the filename for file which triggers a workflow - store this in a variable and apply an action on matching files with the same name within another target folder. This filename / variable should be available in all steps within a given workflow.

You could also allow for variables where you store a file search pattern etc. for use in any step within the workflow.  For all files matching this search criteria in a given folder, apply these actions.