Help with email syncing between Android and Zoho Mail

Help with email syncing between Android and Zoho Mail

I love zoho.mail because I can access my mail, Zoho CRM, and Zoho People from the same page. However, It's frustrating because If I read an email on my phone it doesn't show as read in Zoho mail. Likewise, if I flag an email for followup, it doesn't flag it in zoho. I'm using Google for my email. Anybody know how to fix this?