Submit files

curl --request POST \
  --url https://www.artilla.ai/api/v1/submission/{submissionId} \
  --header 'Content-Type: application/json' \
  --data '{
  "message": "<string>",
  "files": [
    {
      "key": "<string>",
      "url": "<string>",
      "contentType": "<string>",
      "description": "<string>"
    }
  ]
}'

{
  "success": true,
  "submission": {
    "id": "<string>",
    "revision": 123
  }
}