How to supply hidden field value to node based on webform? Using D8 to create a node based on a Webform named "White Paper". I have a hidden field on the webform named white_paper_title. 

When creating a node based on this form, I've added the following in the Default webform submission data field, like so:

white_paper_title: 'something'


This works fine if I base the new node on Webform, and select "White Paper" from the list.

The problem is that it never works when I create a new content type based on the White Paper webform. When viewing the node in the browser, the hidden field is there, but the value is never plugged in. How do I get this working?
You can pass a field's value as a token to the webform.

You would need to add 'field_white_paper_title' to your webform node and then change the "Default webform submission data (YAML)" to

white_paper_title: [webform_submission:node:field_white_paper_title]