Mobile App Screen Rotation for Apple products

Mobile App Screen Rotation for Apple products

I have the ZOHO mobile app for my Samsung S6 and my Iphone 6.  In my S6, I can turn my screen landscape wise and the screen will rotate so i can see more of my screen horizontally. However, no matter how I turn my Iphone 6 or my larger IPAD, the screen won't rotate.  Yes, I even have the screen rotation button on UNLOCKED so it should rotate. All other apps rotate except Zoho mail.  Is there a way to enable screen rotation?