Quota for mail attachments ?

Quota for mail attachments ?

Hi,

Why do I keep getting the same problem using my Zoho mail connected to my ZOHO CRM:
"You have exceeded your file storage limit by storing your attachments. Upgrade your file storage or you can send mail without the attachments" 

Where can I see that quota ?

Why do my colleges on the  system do not get the same indication?

Regards,

Kobi