It adds the following capabilities on top of free version
- Priority updates
- Unlimited tagging, allowing you to create multiple "playlists"
- Extended cross-fading functionality
- Ability to auto-delete tracks during playback
- Option to stop on power loss
- Option to continue playback for next folder, after current folder finishes
- M3U support
Some of the other features shared between two editions
- playing folder trees AND individual files within folders
- integration with Bluetooth headphones (and your car)
- integration with last.fm (via scrobbler)
- pauses during phone calls and navigation speech
- sequential and random play
- configurable settings
- Equalizer
- Double press headset button to skip track
- Search
System Requirements:
Requirements: Android 5.0+
Home Page-

https://play.google.com/store/apps/details?id=com.folderplayerpro&hl=en