Hi,
I’ve finally found out the solution; all the credits to @litation thx to his thread Transcode issue).
Worth sharing this information, which will be very usefull for all OMV users, running Plex in a container.
By default OMV mount the disks with noexec option, in particular the RAID5 volume on which I’m storing Plex config and media binded volumes.
You must edit /etc/fstab and remove the option noexec on the volume where you store Plex Media, and suddenly you can watch your video using Web Player.
