I bought an evaporated milk, used half of it and stored it in refrigerator. Then I bought a liter of commercial fresh cow’s milk , drank one glass and stored it again inside refrigerator.
The question: Is it okay to store opened milk inside refrigerator? / in freezer?
It is okay to place milk in freezer. Transfer the milk in a suitable container. Allow enough head space because its volume will definitely expand. Then thaw and shake it well before using again to homogenize any fat separation.
Placing opened milk can in refrigerator is a different issue. It might be okay if the opened milk will be consumed within the day or the day after. After that period safety of milk is not guaranteed. Someone might suffer from food poisoning because of the negligence. Fresh milk spoils faster that evaporated and condensed milk.
Milk is an excellent source of food for bacteria. Many species can still grow at refrigeration temperature.