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Desk is in an awkward place for ethernet and wi-fi is coming through a solid wall with a fridge/freezer and microwave between the desk and AP. I do have plans of moving an AP and upgrading to wi-fi 6 but that's a bit costlier.
Powerline is possible but I've found them hit and miss in the past and in this case one end will be plugged into a 12 way mains adapter and the other into a 6 way one.
I guess a Raspberry Pi just showing as a network share should do it. Just not sure whether I need to do any annoying shit around mounting stuff to get any USB drive/stick (including NTFS ones) to show up automatically.
You could certainly use the Pi4 as a wired client and plug your USB drive into it; you don't need a screen as you can remote control from your desk PC. Or possibly automate the upload.
But is there a good reason not to connect your desk PC/device to Ethernet, or powerline, or better Wifi?