Hi Andy,
Swipe your finger from the top to the bottom of your printer screen, then tap the ethernet or wifi icon and locate the printer's IP address.
From your computer open File Explorer and click on This PC on the left pane.
Click the top Computer tab and then click the Map Network Drive button.
Type your printer IP with 2 backslashes ahead (e.g. \\10.0.0.5), press the Browse button and select the Memory Card folder.
Keep the Reconnect at sign-in option checked and complete the wizard, you will now have USB Flash Drive as a virtual disk under This PC.
Regards,
Shlomi