I've been using this app for a couple of years now when I get new songs and try refreshing the app so as to be able to listen to them they wouldn't be in the list. Even when I rearrange the playlist to recently added, I don't find them but they're available in other apps and in my phone's storage and even working perfectly fine. If been having this issue since around late 2020 or early last year but I didn't uninstall the app cuz I loved it. I think it's time to trash it.