Grab Android transfer for your Mac, job done... There may even be a better bit of software about now, have a look around...
Android file transfer requires the screen to be unlocked so that the computer can access the phones storage, and as the screen is constantly blacked out that's a no.
Try plugging it to a windows pc
I was hoping you hadn't locked your phone's screen... Oh well...
@Crop started
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Grab Android transfer for your Mac, job done... There may even be a better bit of software about now, have a look around...