Nexus 9 - Lineage OS 14.1 (7.1.2) - SuperSU v2.82-SR3 (not SBIN mode).
After using Flashfire to backup my device, I can no longer access USB storage (with stickmount), as others report a zero size file in UsbStorage location. Solid Explorer and another file explorer would not give access. Tried other sticks with same problem.
Drives can be still access with inbuilt OTG support, Flashfire, TiBu and TWRP all see the drives.
I also downgraded my vendor image (around the same time), because I was using the latest, but rom required the prior version.
Tried various solution of wiping cache of the apps and the device itself.
Any solution available?
Edit: - Found a solution for CM14/LOS14.1 doesn't resolve the stickmount issue. But make the need for it redundant!
CM13/CM14 USB OTG mount problem fix
In a terminal: -
su sm set-force-adoptable true