drag and drop from itunes to usb drive

I am using OS X 10.15.7 Catalina and Music 1.0.6.10 and am having trouble dragging and dropping files to a usb drive for use in my car.I have formatted the drive to fat32 as I have done in the past with no problems but only some of the files are going into the drive.

What I want to do is select a certain genre to put in the drive. I downloaded iVolume and have adjusted volume levels on all files in my hard drive but this does not explain why only some files go in but not others.

I have full access to do this on my computer and external hard drive as i am the only one who uses it.

I have read lots of suggestions on this forum but some have not been updated in years.

Any additional help would be appreciated.