const options = {method: 'GET', headers: {cookie: 'overlay_session='}};

fetch('https://getoverlay.io/api/v1/files/{fileId}/content', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const options = {method: 'GET', headers: {cookie: 'overlay_session='}};

fetch('https://getoverlay.io/api/v1/files/{fileId}/content', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request GET \
  --url https://getoverlay.io/api/v1/files/{fileId}/content \
  --cookie overlay_session=

"<unknown>"

{
  "error": "<string>",
  "code": "<string>"
}

{
  "error": "<string>",
  "code": "<string>"
}

{
  "error": "<string>",
  "code": "<string>"
}