Hi @Gristy
You haven't posted an image of your Flow and I can see you have just one connection, that indicates you are only using "Convert Word Document to PDF Connector" after triggering with a button.
You will notice that connector doesn't offer to save the file anywhere hence why I have used in addition, "Create File" to either SharePoint or OneDrive maybe and this done the trick for me. No Output with it, granted I got no error at that stage though.
If you recreate like mine exactly it will work I am sure. Can you try it?
Here is also a helpful video recently posted by a SuperUser on the Word connectors as they are new.
If you have found my post helpful, please mark thumbs up.
If this post or the one above with the Flow image has solved your problem, please click "Accept as Solution".
Any other questions, just ask.
Thanks, Alan