Unable to deploy to device with Mac OS X Catalina

I've built a data field app that is working in the simulator. I'd like to deploy it to my fenix device. However, when I connect my device via USB I don't see it mounted under /Volumes so I can't set the required "output directory" in the "Connect IQ Build for Device Wizard".

I've tried using both Garmin and MTP USB connection modes on the device. The Garmin Express app is successfully connecting to my device and is able to sync and install updates.

Would love it if anyone else had other ideas on how to troubleshoot this issue - thanks!