postprocessing question on ${filename}

Hi,

New user here.
I'm struggling with the post-processing parameter ${filename}.
From the Help it appears to contains only the filename itself.
However when you pass it to powershell that file is preceded with the absolute path.

I could "Monte Carlo" it if my EDI partners where more willing to send test data, so this question is also about "how can you setup a fake partner that sends in data" so testing can be done at leasure. I can't test if I don't receive data thru the Mendelson pipe.

Back on topic, here's the post processing command:

C:\Progra~1\PowerShell\7\pwsh.exe \\myserver\scripts\logistics.uk\inbound-gvms.ps1 -filename ${filename}

The invoked powershell script starts off with a simple param to receive ${filename}

param( $myfile)
....

thx for any pointers