Upgrade iosapp
1. Go to https://itunesconnect.apple.com/webobjects/itunesconnect.woa.
2. Select the manageyour app and select the application you want to upgrade. The information page of the application is displayed.
3. on this page, your application icon under CurrentVersion will display your application status. Click the addversion button on the right,
4. Enter the version number you want to upgrade and the new features or modified bugs added to the new version.
5. after that, go to the lower-level interface and prompt your application to "preparefor upload". Click "readyto upload binary" in the upper-right corner to go to the "exportcompliance" interface, the first option is to ask if you want to add encryption and select No. The second option is yes. All the following versions are selected; continue;
6. Go to the "versionrelease control" Page, select automatically, save, and enter the "waitingfor upload" status
7. Use xcode to package and upload. For detailed steps, see the document and use "xcode to package and upload an app"