Trouble loading gcodes

I am using Carbide Create to make gcodes for my Onefinity to download to a usb stick,First one was just a test run went fine,Haven’t been able to get a program to load since,I create a program in Carbide Create on my computer,Save it to my computer in gcode and send to thumb drive,It shows on my computer that its on the thumb drive,When i plug it into one of the usb ports on the control box on Onefifity and hit the folder on screen,nothing,its as if i never put the usb stick in,Don’t show in the little bar or anywhere,What am i doing wrong? thanks

Is it a USB 3.0? The controller will only recognize USB 2.0

Are you sure you saved it into the main folder?