Nvidia Shield Tablet, can't move files to microSD

[Binsk]

I just bought a Nvidia Shield Tablet and so far I really like it. However, I bought a microSD card but I can't use ES File manger (built in) or solid explorer to move or copy files to the card. I'm running android lollipop and I understand that I need to grant the apps permission to move the files. However when I follow the in-app instructions it doesn't work saying "Unfortunetly, Documents has failed" Any help is appreciated, thanks.

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