SDHC card not readable?

Is there a secret to getting the LCD controller to display the files stored on a SDHC card? I have 2 new sd cards one formatted FAT32 and one not formatted with a xxx.nc file on them and both will indicate being inserted but will not list the files in the menu. I can manually move the axes via the controller.
I’m using all vicious equipment and have flashed with this file.
rc7_mpcnc_lcd_9916

Rename it to .gcode. I don’t think the LCD sees .nc.

Mine has to be .gco or .nco on a FAT32 card. not sure if theres a size limit to the card. Mine are 2gig. (recycled old camera cards)

Thanks Bryan.