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

{
  "filename": "<string>",
  "sheets": {},
  "total_sheets": 123,
  "message": "<string>"
}