On Windows, Spotify runs a scan on all your music folders as soon as you install the app. How to Add Local Files to Spotify on Windows Note: You can only insert mp3, mp4, and m4p files. Once the local files get added to your Spotify playlists, you can listen to them just like any other song. To make the process easier, ensure you download everything first and store all the tunes in one folder. Remember that the local files you want to add to your Spotify library must be on the computer or a USB drive or stick connected to it. If you want to stream the local files on your phone, we suggest you do this.
If you want to move the local songs, you can add them to separate playlists, or you can make a brand-new playlist for them.All the songs added will be stored in the Local Files songs folder in the Spotify library.You can add separate songs or an entire album.
In the same section, Spotify will suggest folders from which you can add the files (usually Downloads and Music library).