Ok - i'm back.
made suggested change
in /lib/systemd/system/mount-network-shares.service replace
sudo sudo systemctl daemon-reload
using file manager, showed nothing in directory /mnt/Media/pi
then executed sudo mount -a
went back to using file manager, navigated to directory /mnt/Media/pi...now all the files in the share are visible...and media files will play.
Also verified PLEX functions normally.
OPS !! MY BAD !
Then I noticed I did not make the full substitution/correction. I left out "Requires=systemd-networkd-wait-online.service".
So - went back, edited /lib/systemd/system/mount-network-shares.service replaced and verified (!) I made the correct...corrections.
executed sudo sudo systemctl daemon-reload
PLEX does not see or play media files.
Also - now...nothing shows up in /mnt/Media/pi.....? (pls note from above - it did have contents. The script is changing something...??)