How to Create the Upload File for Application Loader?

Solution 1:

• Launch Xcode 5 (Product > Archive to build the archive)
• Goto Window > Organizer
• Select the latest archive and click on the Export button
• Select Save for Enterprise Deployment or Save for Ad Hoc Deployment
• Select your provisioning profile and then Export
• Choose a location to save the .ipa file

This is basically it. Hope it will help anyone looking for the answer.

Solution 2:

Go and login to the iOS Provisioning Portal. From the menu on the left, select "Distribution" and you should be landed to the "Prepare App" tab. Read through the instructions carefully, you mostly need the information under "Building your Application with Xcode for Distribution". Remember that "Only Team Agents are authorized to prepare and submit applications for distribution".