How to make an image load by URL in Django?

Question

Django

Good afternoon, I need to implement a file upload form where you can upload a file either from a computer or by URL in Django.
I managed to implement the download from the computer, but I do not understand how to do it through the URL.
Please send.
forms.py

class ImageForm(ModelForm):

    class Meta:
        model = Images
        fields = ['image', 'url']

models.py

class Images(models.Model):

    image = models.ImageField(
        verbose_name='Image file',
        unique=True
    )

    url = models.URLField(
        unique=False,
        blank=True
    )

views.py

class UploadView(View):
    def get(self, request):

        form = ImageForm()

        context = {
            'form': form
        }

        return render(request, 'upload.html', context)

    def post(self, request):

        form = ImageForm(request.POST, request.FILES)
        context = {
            'form': form
        }

        if form.is_valid():
            form.save()
            return HttpResponseRedirect("/")
        else:
            render(request, 'upload.html', context=context)

Now the page looks like this with this code.