how to attach a file to a request with REST API v.3

how to attach a file to a request with REST API v.3

Hello,

can you provide an example of how to attach a file to a request with a given id  with REST API v3?

There is no documentation for that, just a tool in admin- api which uploads a file but doesn't say how to do it...

I tried :

input_data={
"attachment": {"request": {"id": "979"}, 
"name": "filename",
"content_url": "correct url to some file with filename"
}
}

result:

{"response_status":{"messages":[{"status_code":"4001","type":"failed","message":"value for fields [name] [content_url] is incorrect"}],"status":"failed"}}

Regards
Rafal

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