USB extension and permissions with the PR2100

I have plugged in a USB extension to my PR2100 but having issues with permissions (nobody and share) instead of 1001

I mounted the drive via the web console

From the command line it looks like so

image

The drive looks to be mounted as ext4. I tried to modify permissions through ssh (Operation not permitted and Windows without any luck (see below).

Any advice?

I formatted my external drive from exfat to ext4 and things are working fine now.