Manual:Hooks/UploadVerifyUpload points to UploadBase class documentation. However, the link results in a 404 error. See https://doc.wikimedia.org/mediawiki-core/master/php/classUploadBase.html

The file, however, is documented. See https://doc.wikimedia.org/mediawiki-core/master/php/UploadBase_8php.html

I don't know why this is happening. The class is abstract, however there are other abstract classes out there that have generated documentation, like RCFeed.

The class doesn't appear in the class list, and the class name is not clickable on the class diagram on UploadFromStash.