Spherium is an excellent option for viewing panoramic images from the iOS Photos app. It provides the option to share the entire image or a select section (a snapshot) via an iOS share sheet. It does exactly what it promises with a simple, elegant interface.
The app could be made even more useful (to me, at least) by adding the ability to search for specific images using titles, keywords, locations, or dates. In my library, it’s tough to differentiate among the many aerial images shown through the interface. Short of that, the inclusion of more information fields (title, keywords, caption) on the info page could help to identify images. Even the option to show larger thumbnails would help.
Despite my specific use case desires, Spherium remains the best 360 panorama viewer I have found for the iPhone and iPad.