Some apps do great when multitasking. For example, I'm using the XBox Music Android app on my Jolla Phone to stream music from my cloud collection. The music keeps playing if I minimise it and even if open up other apps, it still keeps playing. It even pauses when there's a notification sound. Other than the interface, it feels very native to me this way. The OneDrive app also keeps syncing when multitasking, same goes for the OneNote app.