If you upload a pre-edited video with music already added to it, TikTok will flag your video for copyright. You will instead need to add music to your video using the in-app Sounds library.
Please note that it is not possible for us to 'whitelist' your profile to avoid this.
If you cannot find your music within TikTok's Sounds library, this may be due to the account type you have selected. Please see here for more info: Why can't I find my music on TikTok?