As a longtime Spotify devotee, I'm always shocked people don't know about one of its best features — here's how to use it

Spotify

With nearly 200 million monthly users — of which a staggering 83 million are paid subscribers — Spotify is one of the most popular music services in the world.

It's easy to understand why Spotify is so big. As a longtime paid subscriber, I have universally positive things to say about the streaming service. It has a huge music library, it's easy to use, and it works with every device I operate daily — a Pixel 2 smartphone, a MacBook Air, and Sonos speakers. It even integrates into my PlayStation 4 and Xbox One.

But there's one function of Spotify that truly sold me on the service: The ability to upload music into my library on one device, and for that music to become available on most devices I own.

Jay-Z's album "4:44" isn't available on Spotify, but I was able to buy it and add it to my local library. It's available on my phone, or on my computer, or wherever else I want — seamlessly — through my Spotify account. Spotify/Ben Gilbert/Business Insider

It's a little known convenience of Spotify that made the service far more useful to me — here's how it works: