Setting path:
realme UI 7.0: Music app > Top right corner profile picture > Settings > Find Local Music
realme UI 6.0: Music app > Settings in upper right corner > Device Files Importing Filters
realme UI 5.0 & 4.0 & 3.0 & 2.0: Music app > Three dots in upper right corner > Find Local songs
realme UI 1.0: Music app > Two dots in upper right corner > Scan Local songs
realme UI U Edition: Music app > Settings > Downloads and storage > Show device files
realme UI R & S & T & Go Edition: YT Music > Songs > Songs on your device will show up here