I cannot connect my one plus two to my computer or laptop. debugging option is saying "Device is in charging mode, USB Debugging is disabled"

I am using One plus two. But it is not connecting to my system. It used to connect previously. But once i set it on Charge only mode. since then there are no options in the notifications bar to transfer the matter from phone. I have tried all the steps explained, even the clicks on build number. But nothing helped me out USB debugging option is saying Device is in charging mode, USB Debugging is disabled. and i tried all the ways to enable it, but it is not letting me do it. and when i click on three dots in the storage, and click on USB connection settings it says connect your device to computer to access USB connections, even when the device is connected. Please help me out to solve the problem