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.
austinuk
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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.