Thank you for replying! What I was trying to do was to create shapefiles in ArcGIS Pro, then put them on a map in ArcGIS Online. Then, after I asked the question, I realized I could run the Share Map command in ArcGIS Pro, and it will upload the map into Content. Then when opened in Map Viewer, it looks identical to the one in Arc GIS Yay! I also did what you suggested and opened a map under the Map tab, but when I try to add content, the only shape files that show up is the MAP_WFL layer that was uploaded as a feature layer when I shared the ArcGIS Oro map. It has all the shapefiles from that map in that file. So, I guess the only Content that can be added to a WebMap are feature layers. Anyway, I'm muddling through this, trying to learn both ArcGIS Pri and Online. I was pretty proficient in ArcMap, could do what I wanted to do anyway, and I had played with ArcGIS Online some. I can see now that this will be better. Eventually😎