I need to upload a file from an external source to zoho.

from the panel of "Leads" -> "Attachments" I can upload files to my clients profiles, but I also need to upload them from my website (I am currently at a point where i can send and retrieve information to/from zoho using your API's so my clients can fill out their own information from my website and save it in zoho CRM)

this is possible?

excuse my translation, but English is not my native language. thanks