How to Upload a Video from a CDN URL as a Facebook Reel via API Without Downloading Locally?

I'm working on a Python script that uploads videos directly to a Facebook Page as Reels using the Facebook Graph API. My videos are hosted on a CDN, and I would like to upload them directly to Facebook without downloading them to my local server.

I am currently using Facebook's video_reels endpoint to upload videos as reels. For local files, the process works perfectly by uploading the video in binary form. However, I want to avoid downloading the video locally when it's hosted on a CDN and instead directly upload it from the CDN URL.

Here’s a simplified version of my current code:

import requests # Facebook API parameters page_access_token = 'your_page_access_token' page_id = 'your_page_id' api_version = 'v20.0' video_url = 'https://cdn.example.com/video.mp4'  # CDN URL of the video video_description = "My awesome reel" video_title = "Reel Title" thumbnail_path = 'thumb.jpg' # Step 1: Initialize the upload session for reels def initialize_upload_reel():     url = f"https://graph.facebook.com/{api_version}/{page_id}/video_reels"     payload = {         'upload_phase': 'start',         'access_token': page_access_token     }          response = requests.post(url, data=payload)     if response.status_code == 200:         data = response.json()         video_id = data['video_id']         print(f"Upload session started. Video ID: {video_id}")         return video_id     else:         raise Exception(f"Error initializing reel upload: {response.text}") # Step 2: Upload the reel video file def process_upload_reel(video_id, file_size):     url = f"https://rupload.facebook.com/video-upload/v20.0/{video_id}"     headers = {         'Authorization': f'OAuth {page_access_token}',         'Content-Type': 'application/octet-stream',         'offset': '0',         'file_size': str(file_size)     }     with open(video_url, 'rb') as file_data:         response = requests.post(url, headers=headers, data=file_data)          if response.status_code == 200:         print("Reel Uploaded")     else:         raise Exception(f"Error uploading reel video: {response.text}") def publish_reel(video_id, description, publish_time=None, published=True):     url = f"https://graph.facebook.com/{api_version}/{page_id}/video_reels"     thumb_file = {'thumb': open(thumbnail_url, 'rb')}          payload = {         'access_token': page_access_token,         'video_id': video_id,         'upload_phase': 'finish',         'title': title_entry.get(),  # Ensure title is passed         'description': description_entry.get()  # Ensure description is passed     }     if publish_time:         payload['video_state'] = 'SCHEDULED'         payload['scheduled_publish_time'] = publish_time     else:         payload['video_state'] = 'PUBLISHED' if published else 'DRAFT'     response = requests.post(url, data=payload, files=thumb_file)     thumb_file['thumb'].close()     if response.status_code == 200:         check_video_status(video_id)              else:         raise Exception(f"Error publishing reel: {response.text}") 

The Problem: When I attempt to upload using the CDN URL, I receive the following error message:

{   "error": {     "message": "There was a problem uploading your video file. Please try again with another file.",     "type": "OAuthException",     "code": 6000,     "error_subcode": 1363130,     "error_user_title": "Video Upload Is Missing",     "error_user_msg": "The video was not uploaded.",     "fbtrace_id": "Ai3SicB2QxOVA-ZpIQu7cjT"   } } 

It seems like Facebook's Reels API doesn't support uploading videos directly from a CDN URL using the file_url parameter, or I may be missing something in the implementation.

Question: Is it possible to upload videos directly from a CDN URL to Facebook Reels via the Graph API without downloading the video locally first?

If yes, how should I structure my API request to achieve this?

If no, what is the recommended approach for handling CDN-hosted videos in this scenario (such as avoiding downloading the video to the server)? Any help or guidance would be greatly appreciated!