Highly recommend Jellyfin on your NAS. Sounds like that is what your looking for. Very straight forward and easy to implement compared to other self host options.
Essentially, vid files located on your nas, and then any device on your wifi can stream the vids.
If your looking for your own personal netflix, jellyfin is your answer.
I swear by the Logitech lyft, I know it looks weird. But it just feels natural, give it a day or two and you'll wonder why every mouse isn't shaped like that. I know because thats what happened to me after I used my boss's mouse and then my wife when she used mine.