Note This feature is supported by version 19.5. or greater Note The code uses some of the objects defined in The Business Layer. Saving to HTML with External Resource Files Since version 19.5, The GroupDocs.Assembly provides a great feature which is saving of external resource Files while an assembled document loaded from a non-HTML format is being saved to HTML.
From now on, when saving an assembled document to an HTML File, by default, external resource Files are stored to a folder having the same name as the HTML File without extension plus the “_Files” suffix....Editor Product Solution GroupDocs...Resource Files / Saving to HTML with External Resource Files Saving...