Currently, I am using Photos' video editor to create some music videos of my tracks, with a little bit of visuals since youtube requires audio to be in video format.

However, it seems that once the video proceeds to the end of the music file, it ends, and there is neither option to add a new music track or to loop the current one to keep the music going.

So, generically speaking, is there a way for myself or anyone else to add or loop music to the video editor once a custom music track ends?