Django Imagefield通过ModelForm无法正常工作

from django.db import models

class ImageModel(models.Model):
    image = models.ImageField(upload_to='images/')

from django import forms
from .models import ImageModel

class ImageForm(forms.ModelForm):
    class Meta:
        model = ImageModel
        fields = ['image']

from django.shortcuts import render
from .forms import ImageForm

def image_upload(request):
    if request.method == 'POST':
        form = ImageForm(request.POST, request.FILES)
        if form.is_valid():
            form.save()
            return redirect('success')
    else:
        form = ImageForm()
    return render(request, 'upload.html', {'form': form})

<form method="post" enctype="multipart/form-data">
    {% csrf_token %}
    {{ form.as_p }}
   <button type="submit">Upload</button>
</form>