Django -如何在保存模型时添加文件？

from django.db import models

class MyModel(models.Model):
    file = models.FileField(upload_to='uploads/')

from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST, request.FILES)
        if form.is_valid():
            my_model = form.save(commit=False)
            my_model.save()
            return render(request, 'success.html')
    else:
        form = MyForm()
    return render(request, 'my_template.html', {'form': form})

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