The file you want to create should have 'just your voice'. No backing track.
Play the track.
Record yourself singing with your mobile phone camera.
While recording yourself, listen to the backing track with headphones.
This means that the microphone will only hear your voice! (hopefully - no backing track).
Try to keep the background noise to a minimum. This way we can add your voice to the mix and help you sound amazing!
Once you are finished Upload the video/audio of you singing to this Google Drive.