Rename song - iOS

how to rename a song

Hi - how do I rename a song (or song file - they are the same thing I think).
I realise I must have missed a description for this somewhere which is dumb. But search for ‘rename song’ gave me no help.
Obvs I would like to avoid doing a save-as and creating unwanted copies. Although if the only solution is a work around I’m happy to listen.
Using n-track Studio 9. iOS

I hope that this can help you with your problem.