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If the device is new and running 6.0, you have to grant permissions to file commander or any other app before using it.
Is your microSD working normally? Can you see it in a computer?
What error do you get? Can you post a screenshot?
I think you are either trying to copy something that isn't there or something that cannot be moved. Did you try to restart your device?
Yes i have restarted my phone ..
also i amy trying to copy/move music and video file but not coping/moving.
please see my attachment of application permisions.
from external memory to internal memory coping/moving succesfully but from internal to external not happen
Did you buy the music? In that case, it might be DRM protected.