Just as the title says there are songs I have on my phone that aren’t in Spotify and I’d prefer to have it all in one place
Hey @, welcome to the Community.Hope you are doing great!
Yes that feature is a available for Spotify Premium and you can sync your local music, right from your Mac/PC to your iPhone :)
Just follow me:
Supported file types:
Note: The iTunes lossless format (M4A) is not supported.
For more you can refer to this FAQ about Local Files :)
Have a great day!