Thanks again for all your help! I went under Full Disc Access and the only thing showing was Garmin MapManager.app which was "Un-checked" I checked it as shown;
I then added Garmin BaseCamp.app and Garmin Express.app as shown;
I then tried to add the Zumo as a device in Garmin Express. It wasn't recognized in either situation.
1) Opened Garmin Express > Connected the Zumo > Zumo automatically opened from off
2) Connected the Zumo > Zumo automatically opened from off > Opened Garmin Express
After trying several data cables, the Zumo simply doesn't want to mount to this new M1 Max. In the past on my 2016 MacBook Pro, it would show as a volume like an external hard drive.
I'd like to add, by checking all three boxes under "Full Disc Access", the three Garmin apps are grayed out under "Files and Folders" as shown;
Thank you again for all your help and time in trying to figure out this problem. I sincerely appreciate it.