How to pre-populate a form field with model's foreignkey field's value at form load in Django

I have the following models:

class Member(models.Model):
    member_id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=100)

class Photo(models.Model):
    photo_id = models.AutoField(primary_key=True)
    member_photo = models.ImageField(upload_to='member/', null=True, blank=True)
    member = models.ForeignKey(Member, on_delete=models.CASCADE)

I have created model form, generic views for creating and updating the Member class.

From here, I want to be able to upload members' photos to the second model 'Photo' directly from the ListView for "Member", by adding a link to the CreateView for uploading the photo.

The ModelForm and CreateView for adding the photos are:

ModelForm

class MemberPhotoAddForm(forms.ModelForm):
    class Meta:
        model = Photo
        fields = ('member', 'member_photo')
        widgets = {
            'member': forms.TextInput(attrs={'placeholder': 'Type name...', }),
            'member_photo': forms.FileInput(attrs={'onchange': 'readURL(this)'}),
            }

CreateView

class PhotoUpload(CreateView):
    template_name = "member_photo_add.html"
    model = Photo
    form_class = MemberPhotoAddForm

    success_url = reverse_lazy('member_list') # URL for the ListView for Member class

    # I am trying to use method 'get_inital()' to pass 'member_id' to the form to add a 'Photo'
    def get_initial(self):
        member = self.request.GET.get('Member')
        return {
            'member': member,
            }

In urls.py, I have:

    ...
    path('member_acct/photos/add/<int:pk>', views.PhotoUpload.as_view(), name='member_photo_add'),
    ...

In my template I am traversing thru' the fields in order to display the fields (and their values).

However, as I am intending to do, I am unable to populate the member's primary key value, when the form is loaded (for adding photo) - the field remains blank.

(In a post on SO I have read some poster telling to the effect that

manually go through all the fields you might be not displaying the initial value

But resorting to using the plain form.as_p also did not help.

Is what I am trying to is the right way? Some guidance would be much appreciated.

def get_initial(self):
    member = self.kwargs['pk']    # << Here
    return {
        'member': member,
        }