Need help running roms from USB

[1uke_]

Hardware: 10ZIG 58 ThinClient, 1.8GHz intel atom processor, 1GB RAM
Operating System: Ubuntu Minimal Bionic Beaver 18.04.3 LTS - MATE Desktop
RetroPie Version Used (4.5.1):
Built From: Terminal commands / Git clone
USB Devices connected: 1xKeyboard 1xMouse 1xXbox controler

1x32B Kingston Data Traveler formated to FAT32 on a Windows 10 PC.

Hello,

I have searched the forum for old posts, documentation and I am not getting anywhere with this so hope it is OK to ask here.

I am trying to get retropie to run ROMS from a USB drive.

Here is what I have done so far,

Formated USB stick to FAT32 and added a folder called retropie-mount

In the Retropie menu

Retropie Setup > Manage packages > Manage optional package > Install USB Rom Service

Then

Retropie config > Retropie set up > Config and tools > USB Rom Service > Enable

I have then plugged the USB stick in to the computer running Retro Pie

I left it for a few hours, but then when I put it in my computer I don't see any folders inside the folder on the USB stick.

(Does it matter that there are no ROMs on the computer running retropie at the moment, should it still carry the file structure over to the USB stick)?

Any help trouble shooting this would be greatly appreciated.

Thank you in advance :)