Music not showing within iTunes
Hi there, I have a 12 Pro with quite a lot of music already loaded on the phone. These are songs that I have stored in folders on my laptop. I have a new 2021 selection of music I am trying to add. When I open iTunes, I have moved the music into the library within iTunes so that part is OK. However, on my phone under device, it shows absolutely no music on the phone! This isn't the case as there's about 1500 songs on there at the moment. I cannot get the 2021 songs on to my phone at all. I have tried a sync and it's done nothing at all. The phone is up to date on the latest software. Please can someone help?!
iPhone 12 Pro, iOS 14