Thank you to all the communities who guided me in my questions, but I encountered the correct error in uploading the plugin. The first time I uploaded the plugin, I mistakenly recorded the plugin's DLL file and it was reported as an error. . But when I fix it and reload, I still have it. Even if I change another plugin.xml, I still don't see the new plugin file, but I found the old plugin to have an old error. Hope the community will help me succeed with my first plugin?