Ios 11 problems

FOr me, the same. I have a iPhone6+ upgraded to IOS 11 with erverything reset to the factory setting (erase all contents). Once finished upgrade, I installed the iXpand apps but the"Failed to connect to Iexpand drive.  Please remove and reattach." msg was shown. I did everything I could but still could not use the ixpand again. I wish someone could help me out.