Hosted tiled map services enable fast display of large datasets and provide geographic context for operational layers in the web environment. A tiled map service can be published directly to ArcGIS Online from ArcMap or published from within ArcGIS Online using a tile package (.tpk) created in ArcMap.
In some instances, when publishing the tile package from ArcMap, an incomplete tiled map service is published. In other cases, the shared tiled map service is published but does not display in ArcGIS Online.
When publishing the tiled map service, the data frame extent of the map document is set to Custom Extent. This setting clips the edge of the tiles, leaving a blank area.