Moving Files into FlashAfterUpdate Marshmallow

My question is about putting the GApps and SuperSu zips into the FlashAfterUpdate folder. I've tried to copy the two zips into the folder using ES File Explorer but I get a 'This operation is not supported message'. The native Marshmallow explorer would let me copy the file but not paste it into the FlashAfterUpdate folder. Can you help me with the permissions? I also can't access the tablet via USB anymore, it's just blank, in case that was an option.

I am on a rooted Tab S that I have just flashed 6.0.1 onto.

Any help is appreciated.

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