NEED HELP , Samsung SDXC 64GB card , cant copy files. galaxy S4 Zoom.

I recently purchased a 64GB Samsung evo sdxc card to use with my Galaxy s4 zoom as an upgrade from my 32GB sd card i had been using. I put all my files onto my laptop and proceed to copy the entire folder to the sd card (24GB or so) everything went fine and I put the sd card into the phone and it seemed as if there was nothing on the card music pictures etc. I put the card back into my computer to find that the folders that i copied were still there but the contents of the folders were no longer there. trying this a few more times I copied the files again after formatting the SD card , but instead of putting it in the phone i just removed it from the laptop and put it back in . I received the same results each time i did this. i even tried to format it to Fat 32 to see if that would fix it and still just as before the same result. I have used many sd cards and have never had this problem before, this is the first time ive owned an sdxc card but it should be compatible with my s4 zoom, so the results i am getting have baffled me. any help with my situation would be very appreciated.