My programs have a related (if not the same) problem: the former USB drive mount point at “/storage/xxxx-xxxx” no longer exists as of the Samsung Android 11 update. Not being able to address the USB drive is a killer for backup/sync programs. Mine are POSIX based, but run by legacy apps that should get an opt-out of 11’s permissions changes.
Has anyone been able to verify this regression on a non-Samsung device yet? I’ve posted this in a few other places, but it may just be Samsung. To verify: “adb shell ls /storage/xxxx-xxxx” fails for the USB drive’s ID number (reported in some file explorers).