Passing Argument from Invoked Workflow to Flow Decision

I’m working in a Flowchart where I have Invoked a Workflow. The Workflow has an Argument “fileCheck” that I need to pass to a Flow Decision. I’ve “Imported” the argument by clicking the “Import Argument” button and I have it set the direction to Out. But the Argument is not recognized when I enter it into the Flow Decision. See image:

1/ You need to defne a variable of boolean type, e.g fileCheckVar
2/ You need to asssign it to the argument so it will receive value from the argument
3/ Use the variable in your Flow Decision

a/ use variable to store a value
b/ use argument to pass value to/from workflow