^ Yes. Put the container of fresh milk in the fridge until it's the same temperature as the already stored milk. but the entire container still expires as if it was all stored on the first day, and at that initial time.

I've been told no. The only way would be if you make the container in the fridge the same temperature as the fresh milk, then u can mix them together and store.

Thank you!

Yes as long as it's same day.