Cause: The update resets USB port drivers.
Fix: Perform a soft reset of the Uconnect system: Press and hold the volume/tuner knobs simultaneously for 10–15 seconds until the screen reboots. Then reconnect your media USB.

Earlier firmware versions occasionally forgot your satellite radio favorites after a key cycle. This version locks those presets in permanently.

The headline improvement in 18.45.01 is the refinement of smartphone projection.