will this cable work with a Samsung Galaxy S8? thanks

Yes, this cable will work with a Samsung Galaxy S8 as it is compatible with all devices that support OTG.

Questions & Answers: 2-in-1 Multi-Function Micro USB Host OTG Cable w/ USB Plug Power (OTG Cable + Power Cable), OTG & USB Power Charge Y Splitter Cable for 2.5" HDD/SSD for Samsung Galaxy Tab3 S4 Android Devices

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2-in-1 Multi-Function Micro USB Host OTG Cable w/ USB Plug Power (OTG Cable + Power Cable), OTG & USB Power Charge Y Splitter Cable for 2.5" HDD/SSD for Samsung Galaxy Tab3 S4 Android Devices

Make sure your device supports OTG function before purchase
Micro-B USB HOST OTG Cable, USB version 2.0
Extra USB A Male for power if use mobile 2.5" HDD/SSD
OTG Cable 8 inches
USB-A Power Cable 12 inches

$9^.39 –