Was just out for a walk and listening to an MP4 file with VLC. When I ended the walk I saw I had multiple Whatsapp messages asking me to get something on the way home but I wasn't played the notification sounds (despite the notifications being there in the notification bar).
I can't find how I can allow notifications to interrupt my VLC Audio or Video anywhere. It must be there. It has to be. For the life of me I can't find it though.