I confirm that "Windows + Sandisk Ultra" does not work for "SD card access from computer". But works with the rest.
This should be fixed with
bootlader 1.06.
There were a problem with windows and SD cards > 4Gb.
Curent state :
It's super slow, be patient.
. Windows work fine.
. MacOs does a lot of Write on the SD i have no idea why and is even slower.
But i could access my SD cards with these 2 os.