I was asked to create a workflow to convert the Wiki Page to a PDF.
This is what I came up with
Below is the Detailed history of this workflow. No errors records and no PDF found
|6/23/2015 8:33 AM||Workflow Comment|| Title|
https://sharepoint.pages.com/sites/so/equities/procedures/SitePages/How%20To%20Use%20This%20Library.... Item URL
https://sharepoint.pages.com/sites/so/test/procedures Web URL
The result of fn-Replace is just a string. So the result will be http://xxxx/xxx/page.pdf stored on a string.
That function does not make a conversion from .aspx to any file.
Currently there is not any action to make such task.
There 's a third party product named "Muhimbi" that can be used on a Nintex workflow.
I suggest you to research with them if they have such action.