I'm not sure how this community works, but I saved to camera roll a photo attached to a text on my iPhone, but it's not on my iPad even though the cloud is fully working and has been up till now.
If photo stream is on both devices, the picture should show in photo stream.
Photo stream might be sent to share only when connected to Wi-Fi. Sometimes the photos don't copy immediately.
If both devices are on though you should see the photo in your photo stream on both the phone and the iPad.
Check Photos > Albums > PhotoStream
Retrieving data ...