Been going crazy the past month trying to figure out the unreal online subsystem with steam and couldn't get it working. This does everything I need for interacting with steam, would recommend you support the dev.
Some info that might be useful to others that I had problems with:
- I used the plugin version for 4.23 while on engine 4.25 and it still works, I had to change the steamworks version in code to match what I was using but was good after that.
- When using leaderboards they need to be set something like this I think, https://imgur.com/a/1f4ZY7q basically it goes Check connections to steam > init the leaderboard > check leaderboard is ready to return > request the leaderboard > wait for steam to have data ready > get leaderboard entries.