Uscreen doesn't employ any automated takedowns for music violations, we expect you to manage music licensing on your end.
You also have the option of providing a link to a playlist in your description as well, instead of using music in your recorded video.
If you don't know where to start with music rights management, what you are looking for is a "Music Licensing Platform" on Google. You'll find lots out there like Soundstripe, Pond5, or Artlist. Each will have a list of songs that they have secured the rights to and can license to use for use in your videos. There may be requirements on how you assert your rights to use the music by perhaps putting it in your video description or adding it to title screen in your videos.