When listening to a streaming service in the car, have the audio continue from the last position on another device such as a phone. Similarly, if listening on a device, when getting in the car, the audio should start at the last position.
For all other devices such as a computer or a mobile device, when you switch which device you are listening to, the music will pick up wherever it left off on the previous device. This previous song state is likely tied to the Spotify account somehow. This behavior is different in the Tesla; when I play Spotify it will pick up where I left off in the Tesla rather than what I was listening to on my other devices.
(lightly edited by moderator)