I am using Redmine 3.4.4 and knowledgebase 3.3.1. Perhaps, the "knowledgebase" plugin /plugins/redmine_knowledgebase/app/views/attachments/_links.html.erb works until Redmine 3.3, but since Redmine 3.4 the specification has changed, so _links.html.erb Does not it work as an attached file processing? I thought, and deleted or moved _links.html.erb on the plugin side, it worked.