unable to update pdf and edit category.

my code is not giving an error but it is not performing edit action. and it uploads pdf but not shown in the html page.

*****************View.py****************

def Upload_Charter(request):

    Category_List= Category.objects.all().order_by("Category_name")# for viewing all catogories

    if request.method == 'POST':

        Remove_Category_List = request.POST.getlist('Category_Uuid_delete')

        if Remove_Category_List:

            Category.objects.filter(uuid=Remove_Category_List).delete()# removing the category

            messages.add_message(request, messages.INFO, _("Category Delete Operation Successfully Completed")) 

        else:

            pass

        action = request.POST.get('action')

        Category_Names = request.POST.getlist('Category')

        Category_Uuids = request.POST.getlist('Category_Uuid') 

        for index, Category_Name in enumerate(Category_Names): 

            if Category_Name=='':

                continue

            elif not Category_Name in Remove_Category_List:

                if action=='save':

                    if  not Category.objects.filter(Category_name=Category_Name).exists():

                        Category(Category_name=Category_Name).save() # createing a new category

                elif action=='update':

                    Category.objects.filter(uuid=Category_Uuids[index]).update(Category_name=Category_Name)#UPDATE

        return redirect(reverse('Upload-Charters')) 

    return render(request, 'Upload-Charters.html',{'Category_List': Category_List})  

@login_required

def Upload_Charter_file(request):

    if request.method == 'POST' and request.FILES.get('charters_files'):

        charters_files = request.FILES.get('charters_files')

        fs = FileSystemStorage()

        filename = fs.save(charters_files.name,charters_files)

        uploaded_file_url = fs.get_available_name(filename)

    return render(request, 'Upload-Charters.html', {

             'uploaded_file_url': uploaded_file_url, 'Category_List': Category_List}) 

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