How to view calendar invites in the Zoho Mail app on Android?

When someone emails me a calendar item from an Outlook calendar event, I can only see the details of that event in Zoho Mail on a Web browser, but not using the Zoho Mail app on Android. The only thing that displays in the Android app are the message headers; there is not even an attachment to download and view with another program.

I'm using Android M (6.0.1) and have the latest Zoho Mail app installed. 

Note: I have no interest in importing a calendar invite into my calendar (especially not automatically), I just want to be able to read the message that came into my email inbox and see the details of the invite. 

Please can you help?