‘Multipart: Boundary not found’ with React Fetch POST request, but works with Postman

I’m trying to send an image and two text fields to the express server, but it gives the error “Multipart: Boundary not found”.

    const handleFileUpload = async () => {
    if (!selectedFile) {
      Alert.alert('Ошибка', 'Выберите файл для загрузки');
      return;
    }
  
    const formData = new FormData();
    formData.append('image', {
      uri: selectedFile.uri,
      type: selectedFile.type,
      name: selectedFile.fileName || 'image.png',
    });
    formData.append('title', newImageTitleFile);
    formData.append('description', newImageDescriptionFile);
  
    try {
      const response = await fetch('http://localhost:5000/api/images/upload', {
        method: 'POST',
        body: formData,
      });
  
      if (!response.ok) {
        throw new Error('Ошибка загрузки файла');
      }
  
      const data = await response.json();
      console.log('Загружено:', data);
    } catch (error) {
      console.error('Ошибка:', error);
    }
  };

I tried to remove the header ‘Content-Type’: ‘multipart/form-data’, nothing changes.