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Again, first things first, use a tool like fiddler to see what's going on with your service calls. The "Connect with an ESRI Map Layer" option allows you to import a map layer you host on your ESRI Server onto the Socrata platform.You'll also see how to incorporate Arc GIS Online in external workflow, allowing you to leverage its services including geocoding, drive-time polygons, and geoenrichment.
You can choose to upload an attachment, which can be a document with a legend explaining the different components and customization we may include in your map.
Like with any other dataset, you can opt to make your map public right off the bat or private (this can be configured under 'Edit Metadata' later on and also the contact email which is who is contacted when someone sends in a message to the dataset owner, also done through the About panel).