Pass Unique File Name to Context

Situation:

I have a target file that generates a unique name,

fileName = "file_name"
extension = "csv"
unique = true

The flow generates a unique file, "file_name#######", however, setting a context variable only grabs the fileName property of the file target event, not the generated file name.

How do I get the generated unique file name into a context variable?

Solution:

Use the following value within the Variable Value field:

$$Service.ActivityName.modifiedFileName$$

Where ActivityName is the name of the file target activity.