To download music onto your iPhone, you can use iTunes and Apple Music, or a music streaming app like Apple Music or Spotify.
You can play MP3 files on an iPhone using four methods: the Files app for direct playback, Apple Music to sync files from a Mac, third-party apps like VLC for more features, and cloud storage services ...
It's easy to use Dropbox on your iPhone to upload, download, or share files via the Dropbox app. Here's how to do it.