What is the fine-grained topic of the following text: In this v3.0.2 quick release we have upgraded the plupload plugin with the latest available version(v2.1.2) and excluded/removed the examples folder so if you use this plugin you will need to implement the server side upload handler script yourself with file extension validation. Only return the topic.
Upgrading the plupload plugin in v3.0.2 release and implementing server side upload handler script