audio is not playing even on setting the basic audio without scripting

Hi! Base on the version Unity 2018.2 (ob10) , and following especially what is mentioned on: https://docs.unity3d.com/Manual/class-AudioSource.html (subheading “creating audio resources”) and several youtube videos doing the same thing but :

The short audio uploaded to use it as background sound (and checking –Play On Awake-, in the inspector) cannot be listened on playmode, why would the reason be or what issues I am missing?.

Gratelful for some ideas… ,Hi! Base on the version Unity 2018.2 (ob10) , and following especially what is mentioned on: https://docs.unity3d.com/Manual/class-AudioSource.html (subheading “creating audio resources”) and several youtube videos doing the same thing but :

The short audio uploaded to use it as background sound (and checking –Play On Awake-, in the inspector) cannot be listened on playmode., why would the reason be or what issues I am missing...?.

Gratelful for some ideas…