curl --request POST \
  --url https://api.ffmpeg-api.com/v1/file \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --data '{
  "dir_id": "<string>",
  "file_name": "<string>"
}'

{
  "ok": true,
  "file": {
    "id": 123,
    "dir_id": "<string>",
    "added_on": "<string>",
    "file_name": "<string>"
  },
  "upload": {
    "url": "<string>",
    "method": "<string>",
    "headers": {},
    "expiresInSeconds": 123
  }
}