How to prevent upload the file on submit the form - django

Question

I uploading the file in django with progress bar, and when i choose the file the progress start and when the finish that's mean the file uploaded but when I click in submit form the file upload again and this mean the progress bar is useless, so I want to make something like when I click in submit button the file save with the form but not upload again how I can do this?
my form
class Video_form(forms.ModelForm,):
class Meta:
model = Video
fields = ('video', 'video_poster', 'title',)
the view
def VideosUploadView(request, *args, **kwargs):
V_form = Video_form()
video_added = False
if not request.user.is_active:
# any error you want
return render('account/login.html')
try:
account = Account.objects.get(username=request.user.username)
except:
# any error you want
return HttpResponse('User does not exits.')
if 'submit_v_form' in request.POST:
print(request.POST)
V_form = Video_form(request.POST, request.FILES)
if V_form.is_valid():
instance = V_form.save(commit=False)
video = request.FILES['video']
clip = VideoFileClip(video.temporary_file_path())
instance.video_duration = clip.duration
instance.author = account
instance.save()
V_form.save_m2m()
V_form = Video_form()
video_added = True
if instance.save:
return redirect('home')
contex = {
'account': account,
'V_form': V_form,
'video_added': video_added,
}
return render(request, "video/upload_videos.html", contex)
the template
<form id="upload-form" action="." method="post" enctype="multipart/form-data">
{% csrf_token %}
<div id="progress-box" class="d-none">progress</div>
<div class="custom-file">
<input type="file" class="custom-file-input" id="formGroupExampleInput2" required value="{{V_form.video}}">
<label class="custom-file-label" for="formGroupExampleInput2">Choose Video...</label>
</div>
<div class="custom-file mt-5 mb-4">
<input type="file" class="custom-file-input" id="file2" required value="{{V_form.video_poster}}">
<label class="custom-file-label" for="formGroupExampleInput2">Choose Poster For Your Video...</label>
</div>
<div class="d-flex justify-content-center my-3 px-3" > <button class="btn-block btnn-color" name="submit_v_form"> Upload</button></div>
</form>