My iMac does not 'see' an external device into USB port?

My iMac doesn't "see" my Galaxy S6 when I plug it into a USB port. The same thing happens when I plug my headset intercom of exploitation to a USB port. Nothing appears in the list of devices. I can see my external hard drive listed under devices. I tried different cables and all the USB ports. Both devices to load when it is connected, but they do not appear when I open the Finder. Any ideas on how I can get the Mac to recognize these external devices?

OS X El Capitan 10.11.3 version

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Tags: Mac OS & System Software

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