Why doesn't my S8 Plus acknowledge an external sd card reader.

I have trail cams on my property that use the larger sd cards. I have a small card reader that I have always used in my S5 and worked fine. I just got an S8 Plus and it acts like nothing is plugged in it. I've checked everywhere including the file management.....but cant get it to work. As for the plugin, I am using a small usb plugged into the S8 adapter.
Is there a special S8 external card reader available?

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