I have worked out the answer should anyone else want to know. the easiest way is to connect your phone to the PC via the USB. Then once the phone is identified choose the phone memory. There will be a folder called Notifications so drop your mp3, m4a etc into there and it will be in your default notification lists on your phone.
Qualcomm Snapdragon 835 benchmarks: Antutu, Geekbench 4, GFXBench and PCMark results