Nook Simple Touch, USB-C port on computer, can't find the device

My new MacBook Pro has only USB-C ports (Thunderbolt). I have been connecting my Nook Simple Touch to my older iMac with USB-A ports, and that has let me connect the Nook to ADE. But my old cable doesn't fit anymore, so I bought a USB-C to microUSB cable.  When I plug the Nook into the new MacBook Pro, it doesn't find the device. 

Finder also couldn't find an Amazon Fire Tablet which also uses a microUSB connector. But I half got past that problem by using Android File Transfer. This application lets me see the Fire Tablet's filesystem only in the AFT application window, and not in Finder. I wasn't expecting to use the Fire with ADE, but I'm troubleshooting the connectivity.  Android File Transfer doesn't let the MacBook Pro find the Nook at all, but even if it did, I'm guessing that it wouldn't work with Adobe Digital Editions, because the device doesn't show up in Finder even when I get a connection. But the Fire Tablet won't work with ADE in any case, and even if the Nook could connect via Android File Transfer, that wouldn't let it work with Adobe Digital Editions (since it wouldn't show up in Finder).  I can imagine a workaround by moving the files manually and adding them manually, but that's less than ideal... even if I could get the Nook to connect.

   So is there any thought about getting the Nook to work with ADE on a device with USB-C ports, and if not, are there alternative e-readers that work with ADE on a computer with USB-C/Thunderbolt ports?