Data Loader
When working with Incremental keys or Incremental loads, you must set the Database Connection point type as Data Loader. This adds Use Incremental Load check box next to the Database Driver selection on the Connections tab. If you select the Use Incremental keys check box, then an Incremental keys tab is displayed. You can configure the Incremental keys on this tab.
The Data Loader database connection type, does not have a Documents tab as all the configuration is done in the Data Loader itself.