const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({file_name: '<string>', content_length_bytes: 5242880, content_type: '<string>'})
};

fetch('https://api.dcycle.io/v1/custom-kpi-datasets/{dataset_id}/responses/attachments/presigned-url', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "upload_url": "<string>",
  "file_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "file_name": "<string>"
}