Spotify Android syncing between two phones

[briandoub]

So, I turned my dad onto Spotify about a year ago, and he's been loving using it while he Uber drives. He uses two phones while he drives, one for the Uber app, and a disconnected one for offline Spotify music. Recently, an update came out for the Uber Partner app, but he had filled up his storage on the Uber phone, and was unable to download the update. I helped him to clear cache and saved music on the Uber phone, but he is worried that that will sync over to the Spotify phone and remove his downloaded songs once he reconnects it to wifi. I told him I was pretty sure that the "Clear cache and saved data" option was only for that one device, but he was skeptical. Can anyone confirm? Thanks