Strange Jellyfin behaviour around new media/metadata?

[TheDreadPirate]

The "guest" option. That makes the mount read only. And it looks like you are using NFO saver and, I'm assuming, you're trying to save images with your media. You need to provide credentials for a user with read/write permissions. Also, what is with the # at the beginning? Is it commented out?

Also, LAN IPs are not publicly routable. You don't need to censor it.

Code:

#//xxx.xxx.xxx.xxx/public /mnt cifs auto,_netdev,credentials=/root/.smbcredential,siocharset=utf8,noperm

And .smbcredentials would look like this.

Code:

user=myUser
password=pass
domain=WORKGROUP

And, to be clear, the credentials you put in this file are valid credentials on the host serving the network share.