VERIFIED SOLUTION i
Problem in compressing files larger than 2GB in size.
This is not a known limitation but it has been noted that files greater than 2GB in size do not get compressed as expected.
ResolutionUPDATED: November 2, 2017
Use Windows PowerShell. It is recommended to execute directly on the server that hosts the file. Here is a link for reference:
Product Feature: Automation Server