Calling on ZOHO Creator gurus! Can anyone tell me if it's possible to post file attachment using Deluge?

I'm developing app that works with ZOHO Books sales orders module. When client 'accepts' quote, application generates PDF file and attaches it back to a Sales Order record in ZOHO Books using API:

https://www.zoho.com/books/api/v3/#Sales-Order_Add_attachment_to_a_sales_order