Transfer files problem on Marshmallow

HI i just bought an 128GB sd xc and was thinking, "what if I use the sd card as internal storage," but the problem is I can't transfer file to encrypted sd card via PC, IF I can do that I need a 3rd party app on PC that can transfer files to my sd card. So my problem is, does anyone know a software that can transfer files to encrypted sd card?

Thank you. :)

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