SD cards and the Amundsen infotainment system.

I guess this has been asked and answered dozens of times but I've trawled and found nothing recent.

A few problems.

I'm really struggling to update the Nav system.

1. I only have access to a Mac, on OS 26 Tahoe.

2. Can I use a new card that IS NOT a Skoda original, or must I stick with what I have?

3. The Mac seems to insist on writing extra files to the SD card and messing up the install.

4. Can I simply 'unhide' and delete these files, or is something else needed?

Naturally this has all caught me out with 2 days to go before a big trip - when a Satnag would be very useful ...........

The Skoda Update Portal seems to say any SDS card will do - but it won't ......... unless I've missed something fundamental.

HELP!!