Post notifications for Instagram are routed through the mobile app. This is because, while Zoho Social supports Direct Publishing to Instagram Business Profiles, publishing to an Instagram Personal Profile works differently owing to API limitations.

 
In this case, if you're using a Personal Profile, you will have to enable Instagram Notifications to ensure seamless posting of content.

Once you do this, Zoho Social will alert you every time you're ready to make an Instagram post. To receive posting notifications for Instagram Personal Profiles, ensure your Zoho Social mobile app's notifications are switched on.

 

Now whenever you hit publish via the web app, you will get a notification on your mobile app. 

Learn more about Publishing/Scheduling Instagram posts.