Can't import anything from USB

I was attempting to import a history playlist I had from my XDJ, but when I right clicked to import within rekordbox (5) the option was greyed out. On top of this, dragging tracks or playlists directly into my playlists section doesn't seem to be working, as when I drag and hover over the section my cursor is replaced with the 🚫 symbol.

Is there an easy fix for this? Does rekordbox not allow this? Or is this a bug? I'm running on MacOS Mojave with rb version 5.8.5. My XDJ-XZ has the latest firmware.

-Sam