How to save the automatic call recording files to a hidden folder on Android 5.0 phone?

I have intex aqua pwoer+ with Android 5.0 Lollipop on it. it also has a feature automatic call recording. when we put on the automatic call recording the recorded files are listed in the music player. I want a way so as the recorded files are directly saved to a hidden folder so they are not visible without permission. I have tried protecting the files in call recording option but this option does not have the feature for default hidden recorded files.