For one of my layers I am using the quantity by category symbology from ArcGIS 10.1 desktop. I need to publish this map online, but upon analyzing I receive the message: "Layer uses an unsupported renderer" and "Layer's symbology is not supported". How can I replicate this symbology in ArcGIS online without having to split my layer into one for each category?
How are you publishing your data? As a hosted feature service or a hosted tiled map service? I believe if you publish as a tiled map service it should work. Publishing as features won't work because the rendering is done by the client and web browsers and mobile devices only can draw simple symbols.