Sharing music library with iphone

Starting with Catalina, Apple split up the functions of iTunes among several applications.

Now you use the Music application to import music from your own CDs, buy music from the iTunes Store, or access subscription songs from an Apple Music subscription. You use the Finder if you want to manually synchronize stuff from your Music, TV, etc. libraries to an iPhone, iPad, or iPod.

Intro to syncing your Mac and your devices - Apple Support

annfromnew bern wrote:

I apparently have not save my library to I cloud either.

What Apple calls "iCloud Music Library" is a reference to synchronizing music using either

• An iTunes Match subscription, or
• An Apple Music subscription (where you have turned on "Sync Library")

Synchronizing purchased music over a USB cable would be an alternative to one of these methods – one that does not require a subscription to either service.

You can have an Apple Music subscription, keep "Sync Library" turned off, and synchronize purchased music using the Finder and a USB cable, if you like. (However, since the service only lets you download "offline listening copies" if "Sync Library" is turned on, this means only having access to subscription songs when you are connected to the Internet.)

Plug you iPhone into your Mac if you have right USB port on your Mac. After you finished the Trust dialog box on the Mac and the iPhone and entered your Password this window should appear after you click it in Finder.. From here you should be able to transfer the music