**Inheritance:** java.lang.Object, [com.aspose.words.Node](../../com.aspose.words/node/), [com.aspose.words.CompositeNode](../../com.aspose.words/compositenode/), [com.aspose.words.DocumentBase](........epub. // 1 - Use the document's first..."Document.UpdateThumbnail.FirstPage.epub"); // 2 - Use the first image...