Initialize media upload

curl --request POST \
  --url https://api.x.com/2/media/upload/initialize \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "additional_owners": [
    "2244994945"
  ],
  "media_category": "tweet_video",
  "media_type": "video/mp4",
  "shared": true,
  "total_bytes": 8589934592
}
'

{
  "data": {
    "expires_after_secs": 123,
    "id": "1146654567674912769",
    "media_key": "<string>",
    "processing_info": {
      "check_after_secs": 123,
      "progress_percent": 123
    },
    "size": 123
  },
  "errors": [
    {
      "title": "<string>",
      "type": "<string>",
      "detail": "<string>",
      "status": 123
    }
  ]
}