Once you've cut your audio, you can easily use it in videos and/or slideshows created in Canva or other video editing softward. Adding original sound to a video created on TikTok is a little trickier, but Caroline does a good job of explaining the workaround in this video. The one thing I'll add is that it can take a few minutes for the video you've created with the original sound to be available, so after you've published the private version, take a break and come back before trying to utilize it.