OK, this is a little involved. I have two computers, both Xubuntu 20.04, up to date.

One is a desktop with a big UHD screen that functions during the day to play internet radio, or my own music, and during the evening to play movies, or sometimes over the air television with my HDHomeRun tuner. There is not a lot of software on it, because that's about all it does.

The other computer is my main machine, a Thinkpad P73, also UHD, with massive software installed, a lot of which is for video. I buy hundreds of movies each year, mostly BD nowadays, which I have to rip and encode in order to view them on computer #1. Because I have so many such movie .mkv files I installed Thunderbolt 3 enclosure with 31TB of NVMe drives. It is a delight - so FAST!

The TB3 enclosure is backed up nightly to a Synology NAS, with two 16TB WD Gold drives in RAID0. Both computers have full access to the Synology, so when I want to play a movie on computer #1 I access it on the Synology.

This system works fine, but my life would be a little simpler if computer #1 could access the files on the TB3 enclosure connected to the Thinkpad rather than on the Synology. Everything is on gigabit ethernet, although both computers also have active wifi connections.

I think I need NFS to do this, but I need help to figure out how. Or maybe it can't be done. Any ideas?