New Maschine Plus (May 2022), up to date software.
Following instructions in this post:
https://support.native-instruments.com/hc/en-us/articles/360016355098-How-to-Use-the-MASCHINE-in-Storage-Mode-to-Transfer-Files
Storage mode (Button 3) is not available in System mode.
Mac OS 10.15.7
How to get in Storage mode?