Note This feature is supported by version 19.5. or greater Note The code uses some of the objects defined in The Business Layer. 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....Advanced Usage / Loading and Saving With External Resource Files / Saving...Saving to HTML with External Resource Files Saving to HTML with External...