I see a white screen when sharing book or bookshelf from iOS app? (teacher accounts)

If you get a white screen when you try to share one book or bookshelf from your iPhone or iPad, you may need to reinstall the iOS app. After reinstalling the app, the issue should be fixed. This should also solve the issue on Android devices. At this time, it is not possible to reinstall the web version (app.polylino.co.uk) should a white screen appear when you want to share books/bookshelves.