Video uploads but has no sound

I am trying to upload a video to tik tok which includes a song I wrote. The video uploads just fine, but there is no sound. I get a copyright infringement notice. But the song is mine, I wrote it. I have uploaded other videos with my original songs and have never had this problem. Any help would be appreciated. Thank you.

if you will record video with 1 minute or 10 mins duration on tiktok by select (record video) you will not get copy right issue. please don’t try to upload recorded videos. because tiktok has not allow to upload recorded videos. if you will upload recorded videos you will face this issue.