I made my server on a Linux Debian VPS, but the problem is that I can't install plugins using the .jar file nor extracting the contents. I also can't find the server.properties file, and the only files I see where I installed the server are "worlds", "player", "logs", "plugins", and the main nukkit.jar file. Also, animals don't spawn, I read that this could be because there is no AI made for Nukkit, but this can be fixed with a plugin. Is this true, and what plugin is it? Please help, it's very urgent!