I'm using Drush 9.3 and when I export config it wants to create config files for modules that have been gone for months. One of those is plupload which is nice because it's easy to search the code base to see if I have anything that references plupload whatsoever. I do not. Yet when I run "Drush cex" it exports plupload.settings as well as settings for several other modules that are LONG GONE. When I try to "Drush cim" on the staging server the import fails complaining that these modules do not exist. I'm sure these modules are in fact referenced in the drupal database but I cannot figure out anywhere in the GUI to remove them, no option to uninstall Plupload from the uninstall page. If I do install plupload using composer it appears as a module that can be enabled under the modules page, but still no option to uninstall or remove from the Drupal database. What am I missing? Why does Drupal think I still have these modules?