Missing music on a hard drive.
I have an iMac. I have some music stored in the Apple iTunes Library, but all of my CD's are stored on two external hard drives, each with the same CD's. When I get a new CD, it is downloaded into my Music Library. I then take the new CD, open up my hard drive #1, look for the artist, and then drag the new CD over to a new folder under the artist. I do the same thing with external hard drive #2. Lately, when I import a new CD to the hard drives, on HD #1, all of the info is imported except the actual music itself. All of the info, including the music, is perfectly imported into HD#2. What do I need to do to correct the issue with HD #1? Thank you
iMac 24″, macOS 26.1