Thank you for your post!
You will also need a PDF Reader installed on the machine to "Insert PDF". If you would like a PDF to show in a container field, make sure the container is setup for Interactive Content via the inspector.
If you are wanting the PDF to open in Adobe outside of FileMaker, you will either need to have the file referenced to the container or exported and opened via a script.
Also, I am going to move this thread from the FileMaker Community Feedback Space, which is specifically for input on the Community itself, to the Discussions Space where you should receive more views and potentially more advice!