In this tutorial, we show you the advantage of using the cinematic sequence device and a level sequence to upload one large audio file instead of hundreds of smaller ones. The CSD has more features than the audio device and allows you to pause, scrub, and better control many sounds at once.
https://dev.epicgames.com/community/learning/tutorials/OmM2/fortnite-stop-uploading-hundreds-of-audio-file-to-uefn-try-this-instead