Ubuntu 18.04 running plex server can't mount network disk running at QNAP NAS

[ChuckPa]

May I refer to you the documentation available in

https://forums.plex.tv/tag/server-linux-tips

Of particular attention to:

How to mount media from your NAS shares on Linux using NFS

Mounting NFS network shares for Plex use on Linux . The basic checklist A. Prepare the NAS: B. Create a ‘mount point’ directory structure on your Linux machine which will be where all your media shares are grafted and made available for Plex use. C. Create an entry in /etc/fstab for each share you wish to mount. D. Mount and debug as needed A. Prepare the NAS. This is unique to each NAS. In general, you only need grant read permission. Should you desire Read/Write for yourself, …

and

How to mount media from your NAS shares on Linux using CIFS / SMB

Mounting CIFS network shares for Plex use on Linux . The basic checklist A. Prepare the NAS B. Install , if required, cifs-utils (or appropriate client) on the Plex server system. C. Create the CIFS/SMB credentials file for use in /etc/fstab D. Create a ‘mount point’ directory structure on your Linux machine which will be where all your media shares are grafted and made available for Plex use. E. Create an entry in /etc/fstab for each share you wish to mount. F. Mount and debug as …

You will find the QNAP very forgiving if you use NFS. “It just works”.