I like my new Samsung Galaxy S10, but I am little disappointed that it doesn't have a built in mp3 player. All of my old phones had built in in mp3 players. I dont like how we either have to use Google music or download a mp3 player. Do better Samsung. Hopefully the Samsung Galaxy s20 has a built in mp3 player.
Your S10 actually should have the Samsung Music App if not here are the instructions to get it on your phone. Hopefully this helps.