Missing sound files

[AC Question]

Hi I recently got the Samsung Galaxy S7 Edge. I used the smart switch app to transfer my stuff over from my HTC however when this was done it appears that I am now missing the sound notification & ringtone files. It's like it has deleted the default audio that was originally installed on the phone as my audio file only has 1 audio file from the GS7 and 2 I had on my HTC. Can anybody tell me where & how I get the audio files back for the Galaxy S7 Edge?

Thanks