Sending a emqil with an attachment from django

djando gurus! I need your help! I have an app. It should get the file from the form, then save it to the database and send it by email. I made a model, a form and a view. It seems that everything works fine, the file is saved in the database, a message with an attachment is sent. But the file size in the email attachment = 0 bytes and there is nothing to open it in any email client. What am I doing wrong? Here is a bit of my code:

    models.py:
class Email(models.Model):
    ...
    email = models.EmailField(default='...', verbose_name='Email')

    forms.py:
class EmailForm(forms.ModelForm):
    class Meta:
        model = Email
        fields = [..., 'time', 'file', ...]
        widgets = {
            ...
            'file': forms.FileInput(),
        }

    views.py:
def sender(request):
    if request.method == 'POST':
        form = EmailForm(request.POST, request.FILES)
        if form.is_valid():
            email_save = form.save()

            ...
            email_date = request.POST.get('date', '')

            html_content = render_to_string('email_sender/email_tmpl.html', {
                ...
            })
            txt_content = strip_tags(html_content)

            email = EmailMultiAlternatives(
                email_title,
                txt_content,
                settings.EMAIL_HOST_USER,
                [email_adress]
            )
            email.attach_alternative(html_content, 'text/html')

            if request.FILES:
                email_file = request.FILES['file']
                email.attach(email_file.name, email_file.read(), email_file.content_type)

            email.send()

            return redirect(sender)

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