Why can't i add music that is already on my computer to my iphone after i subscribed to apple music?

Why can't i add music that is already on my computer to my iphone after i subscribed to apple music?

Because youre using itunes

Try Apple music converter, make it easy to enjoy you music on other devices.
https://free-apple-music-converter.en.softonic.com

You can. Just use iTunes to load it.
unless it is Windows Media format, which is not supported by Apple devices. You need to convert to mp3s…

The simplest explanation is that you don't know what you're doing.

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