Hi davefenton79, you may need to use ES File Explorer which can be installed via 1 of the app stores on your device, this gives you more options than the normal file manager, also make sure your HDD/Memory Stick are the correct format, the T8 V3s supports Fat16/Fat32/NTFS formats.
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Really helpful customer support, very fast service. If in doubt on anything big or small they will always help. I have a T8 V and its the best android device I have ever bought, keep up the good work guys.
The people at EntertainmentBox are superb. I won a competition that they put up and it arrived the following day. You cannot get better service than that. You need to buy something? Or service? Contact these people FIRST!