The advanced set meta data workflow component, Set output directory, sets the output directory for the next write to the file system.
The Set output directory component has this parameter:
Output directory
This is the output directory, that is used for the next write(s) to the file system. The {{env:INTERFORMNG2_HOME}} text in the default contents shown refers to the INTERFORMNG2_HOME environment variable to refer to the outbox directory, which is found in the same directory as the InterFormNG2 resources.