Невозможно отправить данные из формы модели с несколькими файлами django

Я пытаюсь добавить несколько файлов с помощью двух моделей и форм. Пытался обновить, но не смог заставить это работать. При отправке формы ошибок нет, но в базу данных ничего не отправляется.

Помогите, пожалуйста.

Также, как определить пользователей как полное имя в выпадающих списках в формах? Пробовал подход с полями форм, но не работает. Также форма не показывает пустую метку

models.py

class Case(models.Model):
    client = models.ForeignKey(Client, on_delete=models.CASCADE, related_name= 'caseclients' )
    statute = models.ForeignKey(Statute, on_delete=models.CASCADE)
    financial_year = models.ForeignKey(Financialyear, on_delete=models.CASCADE)
    proceeding = models.ForeignKey(Proceeding, on_delete=models.CASCADE)
    case_title = models.CharField(max_length=200)
    initiated_on = models.DateField(auto_now=False, auto_now_add=False)
    communication_received_on = models.DateField(auto_now=False, auto_now_add=False)
    first_date_of_hearing = models.DateField(auto_now=False, auto_now_add=False)
    limitation_period = models.CharField(max_length=500, blank=True)
    amount_involved = models.IntegerField(null=True,blank=True)
    person_responsible = models.ForeignKey(User, on_delete=CASCADE, related_name = 'person_responsible')
    assisted_by = models.ManyToManyField(User, related_name = 'assisted_by', blank=True)
    brief_of_case = models.TextField(max_length=1000)
    status = models.CharField(choices=[('Open','Open'),('Close','Close')],default='Open', max_length=100)
    def __str__(self):
        return self.case_title

class CaseFiles(models.Model):
    attachment = models.FileField(upload_to='casefiles/')
    case = models.ForeignKey(Case, on_delete=models.CASCADE, related_name= 'casefiles')

forms.py

class CaseFilesCreationForm(ModelForm):
    class Meta:
        model = CaseFiles
        fields = ['attachment']
      
        attachment = forms.FileField,

        widgets= {
            'attachment': forms.ClearableFileInput(attrs={'multiple': True, 'class': 'form-control form-control-light','type': 'file',}),
        }


class CaseCreationForm(ModelForm):
    class Meta:
        model = Case
        fields = '__all__'
      
        client = forms.ModelChoiceField(queryset=Client.objects.all(), to_field_name="name_of_client", empty_label="Select Client",),
        statute = forms.ModelChoiceField(queryset=Statute.objects.all(), to_field_name="statute", empty_label="Select Statute",),
        financial_year = forms.ModelChoiceField(queryset=Financialyear.objects.all(), to_field_name="financialyear", empty_label="Select Financial Year",),
        proceeding = forms.ModelChoiceField(queryset=Proceeding.objects.all(), to_field_name="proceeding", empty_label="Select Proceeding",),
        person_responsible = UserModelChoiceField(queryset=User.objects.all(),to_field_name="first_name"),
        assisted_by = UserModelMultipleChoiceField(queryset=User.objects.all(),to_field_name="first_name"),

        widgets= {
            'client': forms.Select(attrs={'class': 'form-select form-select-light',}),
            'statute': forms.Select(attrs={'class': 'form-select form-select-light',}),
            'financial_year': forms.Select(attrs={'class': 'form-select form-select-light',}),
            'proceeding': forms.Select(attrs={'class': 'form-select form-select-light',}),
            'case_title': forms.TextInput(attrs={'class': 'form-control form-control-light',}),
            'initiated_on': forms.DateInput(attrs={'class': 'form-control form-control-light', 'type': 'date',}),
            'communication_received_on': forms.DateInput(attrs={'class': 'form-control form-control-light', 'type': 'date',}),
            'first_date_of_hearing': forms.DateInput(attrs={'class': 'form-control form-control-light', 'type': 'date',}),
            'limitation_period': forms.TextInput(attrs={'class': 'form-control form-control-light',}),
            'amount_involved': forms.NumberInput(attrs={'class': 'form-control form-control-light',}),
            'person_responsible': forms.Select(attrs={'class': 'form-select form-select-light',}),
            'assisted_by': forms.Select(attrs={'class': 'select2 form-control select2-multiple form-select-light', 'data-toggle': 'select2', 'multiple': True}),
            'brief_of_case': forms.Textarea(attrs={'class': 'form-control form-control-light', 'rows':4}),
            'status': forms.Select(attrs={'class': 'form-control form-control-light',}),
        }

views.py

def createcase(request):
    if request.method == 'POST':
        form = CaseCreationForm(request.POST)
        file_form = CaseFilesCreationForm(request.POST, request.FILES)
        files = request.FILES.getlist('attachment')
        if form.is_valid() and file_form.is_valid():
            case_instance = form.save()
            case_instance.save()
            for f in files:
                file_instance = CaseFiles(attachment=f, case=case_instance)
                file_instance.save()
    else:
        form = CaseCreationForm()
        file_form = CaseFilesCreationForm()
    return render(request, 'cases/createcase.html',{'form':form, 'file_form':file_form})

    def createcase(request):
    if request.method == 'POST':
        form = CaseCreationForm(request.POST)
        file_form = CaseFilesCreationForm(request.POST, request.FILES)
        files = request.FILES.getlist('attachment')
        if form.is_valid() and file_form.is_valid():
            form.save() 
            file_form.save()
    else:
        form = CaseCreationForm()
        file_form = CaseFilesCreationForm()
    return render(request, 'cases/createcase.html',{'form':form, 'file_form':file_form})