curl --request GET \
  --url https://api.opper.ai/v2/knowledge/{knowledge_base_id}/files \
  --header 'Authorization: Bearer <token>'

{
  "meta": {
    "total_count": 123
  },
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "original_filename": "<string>",
      "size": 123,
      "status": "<string>",
      "document_id": 123,
      "metadata": {}
    }
  ]
}