No, It's not possible that you can upload an Application/Game without XCode. And XCode will only be available in macOS.
- It's necessary that your Apple ID also has been enrolled for the developer account. You can visit here for that: https://developer.apple.com/programs/enroll/
- And that Apple ID requires two-factor authentication as well from any IOS or OSX Device.
- Then after the certificates have been created for the particular application.
- These certificates will gone be used from XCode to upload the Application/Game.
- Of course in new XCode certificates are also been created dynamically & automatically.
Best of Luck!
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