Rekordbox Mac/iOS sync question

I’m relatively new to rekordbox and so far I like it. I stumbled across the iOS rekordbox app for analysing tracks setting cue points etc. Seems like a good idea in principle as the meta data can then be transferred back to my main rekordbox on my Mac.

My question is, when I transfer tracks from the Mac rekordbox to iOS rekordbox, does it just transfer the meta data (cues etc) or the audio file as well? The reason I ask is that all my tracks are already in iTunes on both my Mac and iPhone, so I don’t need another copy wasting space on my phone.