Build on CloudFam API.

{
    "original_filename": "movie_4k.mkv",
    "file_size_bytes": 15032385536,
    "mime_type": "video/x-matroska"
}

{
    "success": true,
    "data": {
        "upload_id": "VXBsb2FkSWQ...",
        "key": "temp-uploads/101/a8f2...",
        "total_parts": 144,
        "part_size_bytes": 104857600,
        "parts": [
            {
                "part_number": 1,
                "upload_url": "https://..."
            },
            ...
        ],
        "expires_in": 14400
    }
}

import requests, math

CHUNK = 100 * 1024 * 1024  # 100 MB
etags = []

with open("movie_4k.mkv", "rb") as f:
    for part in data["parts"]:
        chunk = f.read(CHUNK)
        r = requests.put(
            part["upload_url"],
            data=chunk,
            headers={"Content-Length": str(len(chunk))}
        )
        etags.append({
            "part_number": part["part_number"],
            "etag": r.headers["ETag"]
        })

curl -X PUT \
  "https://<presigned_part_url>" \
  --upload-file chunk_part1.bin \
  -H "Content-Length: 104857600" \
  -D - 2>&1 | grep ETag

Save the ETag response header from each part — you need all of them for Step 3.

{
    "key": "temp-uploads/101/a8f2...",
    "upload_id": "VXBsb2FkSWQ...",
    "original_filename": "movie_4k.mkv",
    "parts": [
        { "part_number": 1, "etag": "\"abc123\"" },
        { "part_number": 2, "etag": "\"def456\"" }
    ]
}

{
    "success": true,
    "message": "File uploaded and finalized.",
    "data": {
        "file_id": 1093,
        "filename": "movie_4k.mkv",
        "file_size": 15032385536,
        "download_link": "https://cloudfam.io/b578rni0e1ka"
    }
}