I use this for my Teslas Dashcam (it was built for it), but it also has a feature to rsync music files from a network share every time it connects to the networ

I use this for my Teslas Dashcam (it was built for it), but it also has a feature to rsync music files from a network share every time it connects to the network and expose it as files on a USB drive to the host. Sounds like it would cover what you want, and it supports RPI Zero Ws natively. https://github.com/marcone/teslausb https://github.com/marcone/teslausb