You didn't miss anything. Transparency cannot be applied to graphics. The "Feature Layer" or "Image Editor" techniques is the only way. Would be a nice feature. Not even certain if there are any plans to do this in the future. Don't think production quality cartography is the ESRI's focus.
Los miembros registrados pueden publicar, seguir actualizaciones y más. ¿Nuevo aquí? Regístrate gratis.
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.