File uploading in flutter

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I am trying to upload a file but I am facing a problem.

Future fileToJsonLines({required File file, required String fileType}) async {

String read = '';
String jsonLinesStr = '';
String filePath = await removeWhitespace(file.path);
log('File : ${filePath}');

try {
  if (file.path.endsWith('.txt') || fileType.contains('text/plain')) {
    read = await file.readAsString();

  } else if(file.path.endsWith('.pdf') || fileType.contains('application/pdf')) {

    Uint8List pdfBytes = file.readAsBytesSync();
    PdfDocument document = PdfDocument(inputBytes: pdfBytes);
    PdfTextExtractor extractor = PdfTextExtractor(document);

    read = extractor.extractText();
    //log('read of .pdf: ${read.length}');
    //log('read of .pdf: \n $read');
  }

  List<String> paragraphs = read.split('\n');
  List<String> jsonLines = [];

  for (var paragraph in paragraphs) {
    while (paragraph.isNotEmpty) {
      String prompt = paragraph;
      paragraph = ''; // Remove the processed portion

      Map<String, dynamic> jsonData = {
        'prompt': prompt,
        'completion': '',
      };
      String json = jsonEncode(jsonData);
      jsonLines.add(json);
    }
  }

  jsonLinesStr = jsonLines.join('\n');
  log('final jsonLines: \n $jsonLinesStr');
} catch (error) {
 log('final jsonLines: \n$error');
}

return jsonLinesStr;

}