When playing from the USB, bookmark the current audio when switching to another audio source. When returning to USB, continue playing from that last spot.
When switching from USB playback to an alternative source, then switching back to USB, playback doesn’t resume from where you left off. Even if using the recent selection it goes back to the beginning of the folder you were in and, especially in a large folder, it can take a while to find the track you were previously listening to. It would be convenient to have the option to resume (or perhaps even having that as the default when going back to USB).