merscever

Im new to Poweramp and I couldn't find answer online. Do info/tag edits in the app actually change the metadata of the local file and not just change inside the app? I have a set up where I sync my android local music library to PC/Itunes and I noticed if I merge albums/change album art/add star rating, that does not get reflected in library or in iTunes Do I need to use another app to make tag/album art/star edits that would reflect in the metadata of the song and subsequently in iTunes? Thanks