Step parameter not passed correctly to 'File System - Find and Replace' library template

I have a final step in my process after a web package has been deployed, where I want to update references to a REST API URL.

It uses uses the ‘File System - Find and Replace’ library template:!/step-template/actiontemplate-file-system-find-and-replace

I configure the steps as per the screenshot but when I check the task log after execution it doesn’t seem to resolve the first parameter - which is a variable appended with the HTML files.

Confused as to what I need to do to get the path resolving? Have wasted a few hours on it at this point.
Any help appreciated.


Typical… :wink:

as soon as I submitted this I came across this page:

It helped highlight that the value I was looking for was available in another variable, namely: