just read this on the retroarch forum - NVidia Shield and Network storage? - RetroArch / Android devices - Libretro Forums
"Yes, this is not a Shield issue but an Android 11 issue. It also apparently affects Plex, and Nvidia is supposedly working with them on a fix. Perhaps this hypothetical fix will benefit us, as well. Nevertheless, we are still working toward a solution for other non-Shield devices, since it appears the asinine “scoped storage” problem is not going away."
fingers crossed someone comes up with something for now i have ARCbrowser running and the network share was all setup pre upgrade. Its still works even though i cant change/rescan or setup new machines
A manual fix for retroarch was posted here https://www.nvidia.com/en-us/geforce/forums/shield-tv/9/482420/android-110-shield-90-app-eg-retroarch-access-to-s/ is something similar possible ?