Hi Steve,
Thank you so much for the update.
Currently, we do not have support for converting the RTF text to HTML file. However, we have logged this as an feature request and forwarded to the development team for further analysis. Please go ahead and create a new direct-trac incident with the simplified sample for further follow up on this feature.
Direct-Trac Link:
https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents
Please let me know if you require any further assistance on this.
Thanks,
Sridhar.S