I have a Galaxy S5 and just added a 64GB SD card. I have Total Commander but admit I do not know how to use it so far. Could someone coach me in the process of transferring files from my Win 8.1 desktop to the S5? I believe there is a plug-in that needs to be installed on the S5 and software called Filezilla to do the transfers but that is the extent of my knowledge on this subject. Marie --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com