I had uploaded an app on iTunes. But it got rejected stating a couple of reasons:
Performance: App Completeness
Performance: Accurate Metadata
And from what I understood the issue was with the app not showing up as intended on the 12.9 inch iPad. But I had made my app for the iPhone itself and not for the iPad. And since iTunes was not allowing to submit the app without attaching a screenshot of the app in the 12.9 inch iPad also, I was forced to attach one.
How can I restrict my app to support just iPhone...?
For some reason, my answer kept getting posted as a comment so I'm just going to add this stuff here. Looks like you need to go XCode Target -> General -> Deployment Info -> Devices and set it as iPhone instead of universal.