Get FileName of a DOC?

Does anyone know how to get the filename of a UCCX document?

Example:

DocumentVariable = DOC[ExampleName.xml]

How do find out the “DocumentVariable” Filename as a string variable value?

i.e. the Filename = “ExampleName.xml”

Use case. The Document is a parameter which can be set in the application admin.

From the script, I would like to know the filename of the DOC.

Gerry