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Why won't my iPhone 6 Instagram post/push from the "Photos" app and show hashtag popularity?

I'm an intermediate user of Instagram on Android, but I've recently upgraded to iPhone. On my new iPhone 6 I'm missing to important features: (1) cannot post/push from the "Photos" app to Instagram and (2) hastags do not pop-up showing me their popularity as I type them. On my Android phone these features work perfectly fine still, but they don't function at all on my iPhone 6. Can someone explain why?