iPhone 13 Pro Max music not syncing properly
I have a new iPhone 13 Pro Max. When I first turned it on I put it next to my iPhone 8 and all of the apps, music, etc. transferred from the iPhone 8 to the iPhone 13.
Now when I plug my iPhone 13 into my computer and try to add more songs it is putting all of the music that is already on there again so that I have two of each song on the iPhone 13.
Its like the computer isn't recognizing that those songs are already there.
I tried removing all music from the iphone (using a Finder sync). Now the computer says there is no music, but the music that I added to the iPhone 13 when I paired it to the iPhone 8 is still there,
I'm totally at a loss on what to do to fix this.
Please help!
iPhone 13 Pro Max