Considering my almost total lack of understaning of Linux I have managed to install Jellyfin on a Raspberry Pi 4. I have plugged in a usb drive with my videos on it but thats as far as I have got. When I select "Folders" how do I point to the drive, does it have to be mounted in some way first?

Also, Thank you and Merry Xmas to all the fine folk here for your willingness to share your knowledge and help out those of us less blessed.