Same thing happened on my S9+ even without the usb flash drive attached to the connector. Been scouring the internet for a solution but this is the first post I'm coming across. I've got an Huawei P20 mate and the same thing has happened so I think this is down to the recent updates. I've four different connectors and it's ihe same. Can't switch from usb device control to phone control and on the P20 mate it just switches back and disappears. Any solution is very much welcome.
... View more