What happens in HA OS when I insert a USB stick? Are there any indications somewhere in the GUI? Will it be available to store files, like a backup? Thanks…RDK
Nothing
No
Depends.
Read here regarding backup
Then there are media folders
What is your goal? You cannot just plugin usb and it work but you can define extra storage for HA to use
If the OS does enumerate the device it will be listed in Settings → System → Hardware → All Hardware.