Cherubian
100+ Head-Fier
You can download the free app Android File Transfer to allow the Mac to read the M2 via a USB cable. However as I said before, file transfer via a cable is extremely slow. Better just copy and paste onto the uSD card using a card reader.
Yes I know, however I don't like ejecting a card every time I want to transfer only one album for example. I'm used not to ejected cards from my other DAPs. I eject only when I upload more albums you know