Thank you for your help.
Yes, I know about this. But when I tried to input the app name “XCloner”, Dropbox told me: “This app name is already taken”.
See screenshot: https://www.imageup.ru/img215/1321446/create-app-dropbox.jpg.html
If I use other app name, your plugin will ignore it. I tried do it whis name “XCloner1” already.
May be I must to do something in the plagin settings?