I'm new to dcs and one of the reasons I got it (except that I love dogfighting) because it looks beautiful and I want to do videos... its amazing that such a super great high tech simulator game has replay functionality that doesnt work at all, and has not been working for a decade, included in their game! (or least since 2008 is what I've been told) Even War Thunder that DSC beats in everything when it comes to realism and simulation, graphics details etc, has a million times better replay system - and it works to.
...I just wanted to upvote this old post but there isn't such a function...
Some say that replay functionality is too complicated - so much stuff to be recorded.... For me all inputs and details are not necessary - just make sure to record the flightpaths correctly first, and move from there - as tacview already do perfectly.
If I recorded my flight - and then afterwards are able to complement it with different angles and other planes - I would instantly buy many more planes and modules - maybe even inspire some friends to do the same through the thing called youtube... And I'm sure many more content creators would do the same if replays would work. Free advertisement and publicity - How is that for a business incentive? :) Show some love for the replay system as you do for the rest of the game. Plz!