pdf generator with pdf dart packaging

Hello, I have a question about being able to display an image positioned in the upper right corner in my PDF document which is already generated. I tried several methods but none of them work for me. Can anyone help me?

This is my custom action:

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import 'package:pdf/widgets.dart' as pw;
import 'package:pdf/pdf.dart';
import 'package:printing/printing.dart';

Future makepdf(BuildContext context, List<VehiculosRecord> vehiculos,
    String? fechaactual) async {
  fechaactual = fechaactual ?? '';

  final pdf = pw.Document();

  pdf.addPage(pw.MultiPage(
      orientation: pw.PageOrientation.landscape,
      build: (context) => [
            pw.Header(
              level: 0,
              child: pw.Column(
                crossAxisAlignment: pw.CrossAxisAlignment.start,
                children: [
                  pw.Text(
                    'Reporte de estado de vehiculos ',
                    style: const pw.TextStyle(
                      color: PdfColors.black,
                      fontSize: 30,
                    ),
                  ),
                  pw.Text(
                    fechaactual ?? '',
                    style: pw.TextStyle(fontWeight: pw.FontWeight.bold),
                  ),
                ],
              ),
            ),
            pw.Container(
              color: PdfColors
                  .deepOrange200, 
              child: pw.Table.fromTextArray(
                headerStyle: pw.TextStyle(fontWeight: pw.FontWeight.bold),
                context: context,
                cellAlignment: pw.Alignment.center,
                data: <List<String>>[
                  <String>[
                    'Unidad',
                    'Sobrenombre',
                    'Matricula',
                    'Encargado',
                    'Estado',
                    'Ultimo mantenimiento'
                  ]
                ],
                columnWidths: {
                  0: pw.FixedColumnWidth(100), 
                  1: pw.FixedColumnWidth(80), 
                  2: pw.FixedColumnWidth(80), 
                  3: pw.FixedColumnWidth(100), 
                  4: pw.FixedColumnWidth(80), 
                  5: pw.FixedColumnWidth(120), 
                },
              ),
            ),
            pw.Container(
              child: pw.Table.fromTextArray(
                context: context,
                cellAlignment: pw.Alignment.center,
                data: List<List<dynamic>>.from(vehiculos.map((vehiculo) => [
                      vehiculo.unidad,
                      vehiculo.sobrenombre,
                      vehiculo.matricula,
                      vehiculo.responsable,
                      vehiculo.estado,
                      vehiculo.fecha
                    ])),
                columnWidths: {
                  0: pw.FixedColumnWidth(100), 
                  1: pw.FixedColumnWidth(80), 
                  2: pw.FixedColumnWidth(80), 
                  3: pw.FixedColumnWidth(100),
                  4: pw.FixedColumnWidth(80), 
                  5: pw.FixedColumnWidth(120), 
                },
              ),
            )
          ]));

  await Printing.layoutPdf(
      onLayout: (PdfPageFormat format) async => pdf.save());
}