Adding podcasts to iPod nano with new MacBook Pro
I recently bought a MacBook Pro (2019) and I want to update the podcasts on my iPod nano (7th generation 16GB). I don't want to lose the music I already have on it. When connected to my MacBook Pro, I ticked the Options in the General tab called 'manually manage music etc.', but when I go to the Podcast tab I can only tick on the 'sync' option. When I do that it prompts that it will sync all my music, and I don't want that. Everything else is greyed out, so is there a way to update my podcasts without losing all my other music content?
MacBook Pro 13", macOS 10.15