Tablet won't recognize OTG flash drive
USB settings are likely clobbered. Samsung tech support cleared up the issue for me with these steps: 


Go to Settings &rarr; Apps &rarr; click on 3 dot menu &rarr; Show system apps &rarr; USB settings &rarr; Storage
Clear data (will not remove files or personal data)&rarr;Settings&rarr;General Management&rarr; Reset (will not remove files or personal data)&rarr;Reset settings. 
Approve all in the second step and tablet will automatically restart. 


I tested with an OTG device and mine worked.