In Firebase Storage it is up to you to determine the file name when uploading the file. There is no built-in method to generate a unique filename for Firebase Storage (like the push() method in the database).
If you have two references to the same path, they will be referring to the same file in Firebase Storage.
If you want globally unique filenames, you'll have to generate those yourself. One way would be to use the Firebase Database's push() method, but you can also use any other GUID-generator for your platform of choice.
