After inserting an USB stick (on a Raspbery PI 2 computer) LibreELEC 9.0.1. mounts it. But trying to use it by scrolling through the files results in an immediately removing device signal in the right corner.
The same with a HD USB drive.
Isn't this a very old bug problem of Kodi?
For the moment, I must go back to LibreELEC 8 If I want to use external USB devices.