At AbstractMessage class at odoo13/addons/mail/static/src/js/models/messages/abstract_message.js
when i console.log(attachment)
i just get an object have 

1. filename: 
   
2. id:  
3. is_main:
4. mimetype: 
5. name: 
   
6. url:
   

But I need more information fname_store (saved in DB) in this attachment.
How i get it