The demo lets you uplad a document and imports it RadEditor through its built-in feature that uses the Telerik Document Processing libraries. You can inspect the demo code and convert the file with other tools that fit your needs better and set the resulting HTML to the Content property of the RadEditor.
As for form fields - RadEditor does not support such a feature, there are two similar things I can suggest:
- Consider adding <input> elements in the HTML with your own logic. Note that the browser is likely to not update/populate them when the end user writes something in them. This is a browser behavior we cannot control.
- Consider using something similar to the Mail Merge code library sample so you can change areas/fields in the content.
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