My finder says my iPhone 14 device cannot be found?

Hi, so giving you all the background info to consider the factors. I have a Macbook Air 2020. My macOS is Ventura 13.0.1. I recently got the iPhone Pro 14 (I'm a new user). I wanted to connect my iPhone to upload music from my mac to my iPhone. I know that with my iPhone, I can access my music library through apple id with that app, and I did that, but it doesn't show all of my music. When I plugged in my device, both finder and music showed my iPhone "item could not be found." I heard recommendations about the cable connection, but my cable and devices are pretty new. I don't believe that could be the issue. Nor restarting both my devices. I tried it nothing changed. I have also noticed that when I try to pair my iPhone and computer through Bluetooth, my computer does show it registering the device. Please Help! The whole resason I transitioned to iPhone was for the synchronisation of all of my devices.