Provide way to allow user to upload values, e.g. geojson, kml, shapefiles.

Add a file picker button/drag and drop area to allow user to input geospatial values data. See shared folder for examples.

Review the shared-folder examples first to identify the supported geospatial value formats, including GeoJSON, KML, and shapefiles. Then locate the current geospatial-value input entry point and define the picker or drag-and-drop behavior, validation, and successful import result. Done means users can provide these values through the interface.

Written by the indexing model from the issue text.