JianGuoYun/NutStore has api limits. The plugin may generate many queries, and it's possible to reach the api limits if there are many files, then do not work properly. It's not a bug and there's no way to fix this situation.
1.**Be aware that JianGuoYun/NutStore has api limits, and the plugin may not work properly because of this.**
2. Register an account.
3. Go to "settings"->"Security", click "Add Application", then obtain the WebDAV account (email), and WebDAV password (a string different from web site password).