Synchronization gmail / zoho

Synchronization gmail / zoho

When synchronization gmail / zoho is done and the "Public - Shared with everyone Share my customer emails with other users in my organization." is selected : 

>> Public e-mail sharing allows us to manage e-mail shares sent from Zoho CRM and the other users can see the responses in the contact form

>> But why the other crm users can't see emails sent from gmail in the contact form ?