Store sound recorder multiply screen

I was create app sound recorder. when i start record on screen1 to screen2 and screen3.
I back to Screen1 sound still here but when i press next screen2 sound record had remove?

How to keep it?
Link My app

When you use a stored variable, you need to check to see if it has a null value when the screen opens. If it does, set it to a value such as an empty string (“”). Like this:

There’s a note in the documentation that says you should be using stored variables instead of Local Storage. You’re using both in your project. See Local Storage - Thunkable Docs.