ipad camera roll not link with photostream
I am using iphone and ipad. My queries, why photos taken using my iphone 5s automatically stored in photostream and camera roll, means, all the photos taken using my iphone can be viewed in my ipad. But, photos taken using my ipad were just stored in camera roll and not link with photostream. I checked all the setting and my icloud is activated in both devices. Any suggestion guys how to solve this? Thanks ☺️
iPad, iOS 7.1