I know I can create a map using hosted features from my ArcGIS Online account, and eventually publish it as a web map. But what I can't find is how to open one of these existing maps (this step is easy), make modifications to it, and then save it back to Online.

Is it possible?

  • What are the precise steps that you have performed to get to where you are currently stuck? – PolyGeo Jun 19 '17 at 23:17
  • It's been some time now, and we decided to stay with Desktop due to the obvious instability/performance drawbacks from Pro. Still, if I remember correctly: - Open the map from the right pane (Catalog's equivalent), in the web content list linked to our Online account. - Made some modifications to the map. - Tried to save it and bounced back to a "This map already exists" message – Horizen Jun 21 '17 at 13:53

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