Storage usage reading wrong

[CommunityPro]

Hi Guys,

I couldn't find anything about this topic (nothing active). I understand a small difference between the android settings and the inbuilt storage reading but not that much. I have downloaded around 700 songs so I thought about 10 MB per song (which would be rather big) would mean something like 7-10GB. Spotify says 5,8 which sounds realistic. But where do the other 18GB come from?

I don't know how it is that much but is this still normal? Any idea what the additional data might be and where to find?