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what exactly are you trying to do? play a video? pictures? what card are you using? does your pc see the card? the more details you can give us the better we can help.
Did you format the card as adoptable internal storage?
SD card formatted with Samsung Galaxy j7 won't appear on alfawise A8 TV box
support HDD, U disk, SD card of 32G....
I got this right from the device specs sheet.
Any SD card over 32G will not work
Don't understand how it can read a 2tb external drive but not even see 128 gig SD card the phone has done something to the card but without access to a computer I can't reformat it.
A 128GB micro SD is the SDXC type. And it sounds like your box can only use the older SDHC type micro SD, which are only upto 32GB.
Your 2TB hard drive is connected via USB, which is different to micro SD cards, and doesn't have any capacity limits.
You could try an external SDXC capable micro SD reader connected via USB, that would probably work.