curl --request POST \
  --url https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/complete \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "parts": [
    {
      "etag": "5d41402abc4b2a76b9719d911017c592",
      "partNumber": 1
    }
  ]
}
'

{
  "message": "File created successfully",
  "path": "/path/to/file"
}