I uploaded my app to the App Store using xcode. I can see my build in my existing app on iTunes connect. However when I want to add the build using the "+ Version or platform" option it shows me a disabled iOS button:
My build version is 2.0.
I received an email from Apple stating that the app completed processing. Any reason why I can't select it?
I found the solution. In my case I wanted to update the app to a newer version which wasn't listed in the "+Version or Platform" menu. The possible reason is that a previous build failed, with the status of "Prepare for Submission".
After doing that I was able to submit it to the App Store.