No problem here with the same setup.
So long as you can see the mapped drives in your Windows Explorer you should be able to see them in Archicad.
Personally I don't use "mapped" drives as I don't like locking file paths to a drive letter - it can be different on each machine so publishing path needs to be reset all the time if workin on the same file on different machines.
I use network locations instead which has the full path of the shared network folders.
But I just tried both (mapped and network locations) and they can both be seen in the Archicad open file dialogue.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11