Damaged file: PDF from XSL-FO Transformation with Fonts

Hello, I am using the PDF from XSL-FO Transformation with Fonts Smart Service from the Dynamic Document Generator (https://community.appian.com/b/appmarket/posts/dynamic-document-generator) plugin, version 1.9.1

I have no examples of using this Smart Service and the plugin documentation doesn't have specific examples.

I have tried to use the only complete code I can find in the community: https://community.appian.com/discussions/f/plug-ins/17891/pdf-from-xsl-fo-smart-service 

This produces a PDF without errors, but when I try to open it I get a "Damaged file" from Acrobat Reader.

This is how I configured the Smart Service:

Xml Document: a constant to test.xml file, with the code from the example

Xsl Document: a constant to _xslStyleSheet.xsl file, with the code from the example

Xsl Parameters: null

Font Document: null

Font Italic Document: null

Font Bold Document: null

Font Bold Italic Document: null

Create New Document: True

New Document Name: "pdf from xml"

New Document Desc: null

Save In Folder: a constant to a folder in Knowledge Center

Existing Document: null

Pause On Error: True

As I said, the process runs without errors, but then when I try to open the generated PDF the result is: "The file is damaged and could not be repaired".

Does anyone have a basic example with settings so I can generate a functioning PDF and develop from there? Thank you