Do I need to rebuild an app to upgrade it?

After you set a version number, the app is rebuilt, with original version information retained. You can modify information, such as the icon, launch page background image, and color. If you do not need to modify any information, click Next to rebuild the app immediately. After you submit an app rebuilding request, you cannot modify any information. The app can be rebuilt in 30 to 60 minutes. In this period, you can refresh the page to check whether the app is rebuilt.