I was able to solve this problem. In my case, unlike OP, I’m using Synology NAS. In case other synology users have this problem, this may work for you:
There is a number of threads on this forum describing the same problem when a Synology NAS sees no files and subfolders in the default video folder even though all access rights seems to be correct. E.g. :
I had exactly the same issue, but found a better way to solve this without moving all media to a different folder.
Just login to your Synology via SSH and execute the followin as the root/admin:
sudo chmod -R ug=rwx,o=rx /volume1/video
(where /volume1/video the real path to your problemat…