Hello I have issues to read usb flash drives

Hello i have issues to read usb flash drives in the micro usb port

My tablet dell venue pro 5830 read the micro usb port to charge, but when i conect the usb otg to put any usb drive dont reconize it (appears and dessapears) so i cant use it proprertly.

also i update de BIOS to the last, and i tried with other usb otg adapters

any solutions?