Samsung Galaxy S7 will not detect OTG

Until recently I could plug my S7 (model SM-G930W8) into my PC and transfer files. Now the PC does not recognize my phone (it DOES recognize my Samsung Tablet). Tried various OTG cables with the same result. Phone will charge but no USB connection. Downloaded OTG Troubleshooter app and it indicates no OTG Detected and No USB Device Detected in Android. I have checked under Developer Options and USB configuration indicates Media Transfer Protocol). Can someone help?

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