If you’re not going to fry the spring rolls straight away, line them all up on a plate and cling film them so that they do not dry up. Make sure that the spring rolls do not touch each other, as they can be a bit sticky and may tear if you need to force them apart.
If there are any leftover filling, you can always freeze it for another Vietnamese Spring Roll occasion.
Alternatively, you may freeze the wrapped spring rolls, to be cooked for another meal.