Can't Upload Image Field With Django 2.1

Hello guys, 

I'm trying to upload user avatar (ImageField type) with my own custom user model following the documentation like this:

class MyUsersProfileView(UpdateView):

# First try

def upload_file(request):

    if request.method == 'POST':

        form = MyModelFormWithFileField(request.POST, request.FILES)

        if form.is_valid():

            # file is saved

            form.save()

            return HttpResponseRedirect('/success/url/')

    else:

        form = MyModelFormWithFileField()

    return render(request, '/my-model-form-with-the-upload-field.html', {'form': form})

# Second try

def upload_file(request):

    if request.method == 'POST':

        form = MyUploadFileForm(request.POST, request.FILES)

        if form.is_valid():

            instance = MyModelFormWithFileField(file_field=request.FILES['file'])

            instance.save()

            return HttpResponseRedirect('/success/url/')

    else:

        form = MyUploadFileForm()

    return render(request, 'my-model-form-with-the-upload-field.html', {'form': form})

but i'm always getting the same error:

TypeError at /user/edit-profile/  getattr(): attribute name must be string  Request Method:	POST  Request URL:	http://127.0.0.1:8000/user/edit-profile/

All other fields got updated but not the profile picture.
I have tried everything but couldn't figure it out.
Any help would be appreciate.
Thanks in advance.

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