Works for me now and was able to submit this morning. Also published another app which I needed to upload screen shots for, and was able to submit for review immediately.

Same issue here (are +1 posts helpful?).

macOS Catalina 10.15.7 iOS 14.1 XCode 12.2 Windows -> Devices and Simulators -> (Right Click iPhone) -> Unpair Device (Xcode crashes) On iPhone, disconnect and reconnect USB. Trust this Computer? Trust Should now be able to build an run your app on the device.