Lexar USB Jump Drive Not Working

Hi Everyone,
I have a 16gb Lexar USB C25i Flash Driveshopping which has stopped working. (For those that don’t know this is a usb flash drive that plugs into the Mac on one end and the other end plugs into your iPhone’s lightning port).

I’m on Mojave 10.14.5 and about a month or so ago my 2016 MacBook Pro Touchbar 13" stopped recognising the drive — I can’t see it on the desktop. However, when I plug it into a non USB-C Mac it sees it just fine. I’ve reformatted it but that hasn’t solved the problem.

Any suggestions? Thanks.