I have many songs added to my library (about 860) and most of them I don't listen to anymore. My iPhone 6 holds 16 GBs of storage and most of the space on it is taken up by system memory, apps, and Spotify which on its own holds around 7 GBs (download quality is set to highest). I need to decrease that amount so I could use the storage I have for other means.
*ADD a limit bar that would give me the option of only saving the last 10 / 50 / 100 added songs for offline listening.
The rest can remain within the playlist for streaming purposes only.