What does Xiamen A Xing (aerial photography) mean by the original sound created in Tik Tok?

The original sound created by Xiamen A Xing (aerial photography) in Tik Tok is the original sound. According to relevant information, the original sound is the original sound of recorded video, and it has not been processed. For example, when a singer releases an mv album, the sounds in his songs and videos are all processed, not the original sound of the singer.