Don't understand INVALID_REQUEST_METHOD when I try to post up an attachment

Don't understand INVALID_REQUEST_METHOD when I try to post up an attachment

When I make the POST request (using python requests.post() for files):
  1. https://www.zohoapis.com/crm/v8/Calls/***************01/Attachments
I get this response:
  1. r:{
  2.   "code": "INVALID_REQUEST_METHOD",
  3.   "details": {},
  4.   "message": "The http request method type is not a valid one",
  5.   "status": "error"
  6. }
  7. requests.exceptions.HTTPError: 400 Client Error:  for url: https://www.zohoapis.com/crm/v8/Calls/*********************01/Attachments

The "files" parameter is
  1. files={"attachmentUrl": link}

Please advise on how I can fix this error.

Thanks
Clark



Info
Latest update (Dec 2025):
There has been a significant delay in delivering this enhancement. Our team is now working towards making it available by the end of January or early February 2026, and the post will be updated as we make progress.