Data upload via USB from Zoom H4N Pro to MacOS 10.15.7 Catalina

I followed all the directions (Video tutorials and Zoom H4N user manual) -- I cannot "select USB Storage" on my Zoom H4N Pro screen - and it doesn't show up on my desktop as an external drive. A previous Q&A in this forum suggested changing cables may help - I tried that too, and same response. Here are the steps that were recommended:

1) Plug USB cable into Mac and into the Zoom H4N Pro (turned off - it will turn on when the cable connects)

2) The Zoom H4N screen will say USB and ask to select from "Storage" or "Audio I/F" and choose storage to access the SD card in the Zoom H4N device or "Audio I/F" to use Zoom H4N as a recorder. (I needed the first option so I select "Storage".

3) A screen comes on that says USB Storage (with USB icon) and a picture of an SD card and a computer with arrows blinking to and from. This is now supposed to be "selected" using the Zoom H4N's "select" button --- DONE.

Then nothing happens -- the screen stays the same and there is no evidence of the Zoom H4N on the Mac desktop showing it as an external device! I tried two different cables - one that came with the Zoom H4N device. When I pull the cable (because there is no device to "eject" from my Mac) - I get a message that the device was improperly ejected. Since I have tried this a few times with the same results - I fear risking any damage by troubleshooting on my own anymore -- ANY IDEAS out there...?

Many thanks in advance for any possible tips.