The HDX system will attempt to create a map, or geographic preview, from geodata formats that it recognizes. For a geographic preview to be generated, your data needs to be in either a zipped shapefile, kml or geojson format. Ensure that the 'File type' field for the resource also has one of the above formats. Pro tip: HDX will automatically add the correct format if the file extension is '.shp', '.zip', '.kml', or '.geojson'. Here are examples of geodata points, lines, and polygons showing the preview feature.
The preview feature will continue to work when there are multiple geodata resources in a single dataset (i.e., one HDX dataset with many resources attached). The layers icon in the top-right corner of the map enables users to switch between geodata layers. Here is an example.