Since autumn 2016 Google is giving warnings/bann’s for outdated information like missing topics/categories/attachments. Thats why we have improved our Diagnotics page. (Backend - components - kunena - tools - diagnotics)
We advice every administrator to check the page, and look if there are issues. Before fixing/deleting the items. Backup First !!! You are going to remove items.
You only need todo this once. Or check every month to be sure, that there are no issues. Some issue’s can’t be fixed automatically, then you need to check the categories settings.
When you remove any attachment, it will be removed on the server. Before only the database item was deleted.
Found errors? Think you can improve this documentation? edit this page