I want to upgrade my 64 gig Micro SD to a new 256 gig card. I purchased a Samsung 256 gig card. I have copied my current 64 gig card onto a portable hard drive. I then tried copying the files back to the new SD card. The phone did not see all the files. I then put the original 64 gig card into a SD adapter and the new 256 gig card into another adapter and copied the files from the smaller one to the larger one. I can see the files on the new card with my PC. When I installed the new 256 gig back into my phone, the files are not recognized on my note 4. Any help would greatly be appreciated.