Why is the image not changing through the form on the site on Django?

Question

Django

Why is the image not changing through the form on the site on Django?
When you add a post, the image is added, but when you change it, it doesn't.
created model
model.py

class Ware(models.Model):
    title = models.CharField(max_length = 130)
    slug = models.SlugField()
    description = models.TextField()
    prise = models.DecimalField(max_digits = 7, decimal_places=0)
    available = models.BooleanField(default=True)
    image = models.ImageField(upload_to='images/', blank=True)
    
    def __str__(self):
        return self.title

moved to
forms.py

class CommentsForm(forms.ModelForm):
    class Meta:
        model = Ware
        fields = ['title', 'slug', 'prise', 'image', 'description', 'available']

views.py

def testimage_add(request):
    if request.method != 'POST':
        form=CommentsForm()
    else:
        form=CommentsForm(request.POST, request.FILES)
        if form.is_valid():
            post = form.save(commit=False)
            form.save()
            return HttpResponseRedirect("/")
    context={'form': form}
    return render(request, 'ware.html', context)


#функция изменения поста
def post_edit(request, pk):
    post = get_object_or_404(Ware, pk=pk)
    if request.method == "POST":
        form = CommentsForm(request.POST, instance=post)
        if form.is_valid():
            post = form.save(commit=False)
            post.author = request.user
            form.save()
            return HttpResponseRedirect("/")
    else:
        form = CommentsForm(instance=post)
    return render(request, 'ware.html', {'form': form})

urls.py

from django.conf.urls import url 
from django.views.generic import ListView, DetailView
from index.models import Ware
from . import views
from django.conf import settings
from django.conf.urls.static import static

urlpatterns = [
    url('shop/(?P<pk>[0-9]+)/', DetailView.as_view(model = Ware, template_name = 'detail_ware.html')),
    url('post/(?P<pk>[0-9]+)/edit/', views.post_edit, name='post_edit'),
    url(r'^$', ListView.as_view(queryset=Ware.objects.all().order_by('-title')[:20],
    template_name = 'index.html')),

] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

Answer 1

well, there are no files right there
form = CommentsForm(request.POST, instance=post)