Zoho Desk API Get Ticket Attachments allways return empty

Zoho Desk API Get Ticket Attachments allways return empty

I'm trying to use the API do sync tickets to my internal Ticket manager.
Tickets and Comments are OK, but Attachments allways return an empty array:
  1. {"data":[]}
I need to pass other parameters?
Example Url: https://desk.zoho.com/api/v1/tickets/13228000020730005/attachments

Thanks in advance.