I had both City Navigator 2022.25 and Topo Active Amerias North on the removable storage on my Montana 700i.
City Navigator was just updated to 2023.10; the update did not go smoothly. Maybe because I had the maps on the removable storage and/or maybe because Garmin Express requires the device to be unplugged from the computer and then reconnected after the update. I forgot to turn on the Montana 700i before connecting to the computer the first time I reconnected.
Anyway, I went through Manage Maps to look at the results. I can view maps on the My Maps tab; which in the Montana 700i internal storage. However, when I try to look at Removable storage I get a popup window "Garmin Express quit unexpectedly" with Close / Report / Reopen as options.
I was able to complete the map update by moving City Navigator back to internal storage. There is not enough space to also move Topo Active Americas North to internal storage; so I am unable to use the Removable Storage tab.
I did take the Report option to send in information.