Can't add existing mp4 movies to Movies library

[fuzzynco]

I’m running RasberryPi OS 11 (Debian) on an 8 GB Pi4B.
I have my Movie files on /media/mypi/transfer/l/Movies
with subdirectories for Comedy, Disney, Drama, Musical
etc. I added to the Movie main the /media/mypi/transfer/l/Movies.
mypi is the userid and pi8 is hostname. I added mypi to the
group plex and changed the perms for …/l/Movie/Comedy/
to 775 and ownership to mypi:plex. I thought that pointing the Movie
library at the local mount point to the directory and giving it rwx access
should let it find the file formatted as suggested.

Plex does see the server.

What am I doing wrong?

[pshanew]

Filesystems which are automatically mounted under /media/username (by udisks2) have ACLs applied to them; these trump any perms you set with chmod.

It’s recommended to create static mounts for your disks using the information in this how-to:

Linux Tips

Using other hard drives (Windows or Linux) with PMS This How-To is written to help with Internal and External drives. It also is written to demonstrate how to cope with NTFS and EXT4 formatted drives. By logical extension, any format supported by Linux can be handled using the technique shown here. In all cases, the goal is to give user plex permission to read your media files which Linux doesn’t allow by default due to its strict security model. We will walk through the steps needed …

You could also try the following. This will modify the ACLs associated with /media/mypi/ to include user plex with read/execute permissions.

sudo setfacl -m u:plex:rx /media/mypi/