Replacing a file in django - django

Question

I have a standard Form to edit an object that has a file field in it. When I add a new profile, everything works fine, but when I want to modify a field, then problems happen: when I don't include request.FILES, all fields get retrieved in the form and can be updated with no problems, except the avatar (filefield), but when I add the request.FILES, fields are no longer retrieved in the inputs, and the form is not valid. What am I doing wrong?
models.py:
from django.db import models
class Profile(models.Model):
name = models.CharField(max_length=45)
email = models.EmailField()
avatar = models.FileField(upload_to="avatars/")
def __str__(self):
return self.name
forms.py:
from django import forms
from .models import Profile
class EditUserForm(forms.ModelForm):
class Meta:
model = Profile
fields = ["name", "email", "avatar"]
profile.html:
<form method="POST">
{% csrf_token %}
<div class="col-md-12">
<div class="row border m-3 p-5">
<div class="col-md-6">Name</div>
<div class="col-md-6">{{ form.name }}</div>
</div>
<div class="row border m-3 p-5">
<div class="col-md-6">Email</div>
<div class="col-md-6">{{ form.email }}</div>
</div>
<div class="row border m-3 p-5">
<div class="col-md-6">Avatar</div>
<div class="col-md-6">
<img src="{{ profile.avatar.url }}" width="100rem" />
{{ form.avatar }}
</div>
</div>
<div class="row">
<button type="submit" class="btn btn-success">Save</button>
</div>
</div>
</form>
views.py:
def profile(request, pk):
profile_instance = Profile.objects.get(id=pk)
form = EditUserForm(request.POST, request.FILES, instance = profile_instance)
context = {
'profile': profile_instance,
'form': form,
}
if request.method == "POST":
if form.is_valid():
profile = form.save(commit=False)
profile.save()
else:
print("form not valid")
else:
return render(request, "app/profile.html", context)
return render(request, "app/profile.html", context)

Answer 1

Special thank's to #bruno desthuilliers and #dirkgroten.
Here is the answer to solve the 2 problems:
def profile(request, pk):
if request.method == 'POST':
form = EditUserForm(request.POST, request.FILES, instance = Profile.objects.get(id=pk))
if form.is_valid():
profile = form.save(commit=False)
profile.save()
return redirect('profile', pk)
else:
form = EditUserForm(instance = Profile.objects.get(id=pk))
context = {
'profile': Profile.objects.get(id=pk),
'form': form,
}
return render(request, "app/profile.html", context)

Answer 2

Try refactoring the code as follows: (edit it if I missed something. After form.is_valid, the same form should be sent in the context to display the errors.
def profile(request, pk):
profile_instance = Profile.objects.get(id=pk)
form = EditUserForm(instance = profile_instance)
if request.method == "POST":
form = EditUserForm(request.POST, request.FILES, instance = profile_instance)
if form.is_valid():
profile = form.save(commit=False)
profile.save()
form = EditUserForm(instance = profile_instance)
context = {
'profile': profile_instance,
'form': form,
}
return render(request, "app/profile.html", context)