Multiple file uploading in django admin

I have File model for uploading file.

class File(models.Model):      files = models.FileField(upload_to='sampleorder/%y/%m/%d', null=True, blank=True)      order_detail = models.ForeignKey(OrderDetail, on_delete=models.SET_NULL, null=True)

and for multiple file upload i have form.py

class FileForm(forms.ModelForm):      class Meta:          model = File          fields = ['files']          widgets = {              'files': forms.ClearableFileInput(attrs={'multiple': True}),          }

and in admin.py

@admin.register(File)  class FileAdmin(admin.ModelAdmin):      form = FileForm      list_display = ['id']        def save_model(self, request, obj, form, change):          files = request.FILES.getlist('file')          for f in files:              instance=File(files=f)

             instance.save()

return super(FileAdmin, self).save_model(request, obj, form, change)

but its only save latest file. how to save multiple file at time? i also see this Upload multiple files using Files Field in Django Admin question but can configure where i am wrong.

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