how do i add my own mp3 files

i cant figure it out

http://blog.flowlab.io/2015/05/uploading-your-sounds-for-use-with.html?m=1

http://forum.flowlab.io/discussion/2659/how-do-i-add-an-mp3-to-my-tank-game#latest

it does not work for my game here is the music i testet https://www.dropbox.com/s/8ed4zmno89g3idp/flappysong.mp3

and here is the game https://flowlab.io/game/play/579235

it is very bad news that it does not work for me because this i have this as my school projekt

Use kiwi6.com

Yeah, looks like DropBox has maybe changed the way they handle mp3 files - lots of folks on here like to use Kiwi6, try that instead.