I installed one of the plugins mentioned here https://www.sweethome3d.com/plugins.jsp and it created the plugins folder. I can see the tools in the top menu but when I am copying my JAR file, I am not able to see my plugin there. I noticed that the plugin I has a .sh3p extension, do I also have to convert my JAR file to .sh3p? If yes, then can you please tell me how to do that.