Make sure when you upload you tick the Device memory box (plc code is top parameters second & device memory bottom), once uploaded you click on the device MAIN in the left hand navigation box, this will show you the data uploaded from the registers.
If you do it in GXIEC Developer, this is a seperate one go to debug & device edit, this opens up a spreadsheet type, put in the type of register & how many then read the device memory from plc then you can save it as a file.