curl --request POST \
  --url https://api.nuvia.ai/v1/tables/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file'

{
  "columns": [
    {}
  ],
  "rows": [
    {}
  ],
  "total_rows": 123,
  "encoding": "<string>"
}