How can I save replays along with the other cars driving? It worked in tmnf, but does TM2 not have this feature?

Thanks

If you were playing in Multiplayer, it will automaticly save the other players !
Or do you want to see other car YOU are playing ?

1. Open the titlepack where you're going to be playing.
2. Go to "Profile".
3. Go to "Advanced".
4. Enable "Save automatically all replays"

Optionally you can also enable "Save each round separately".

These settings are on a per-title basis.

After playing online for some maps...

In your ManiaPlanet\Replays\Autosaves\ folder you will see that you have replays with filenames like:
AutoSave_2016-01-09-16-08-08_Sirius.Replay.Gbx
These are the replays that contain all cars that drove that map or round on the map.

Also in the same folder are replays with filenames like:
eyebo_Canyon_$s$fff a simple road map.Replay.Gbx
basically it's login_TitleName_MapName.Replay.Gbx
These are your PB (Personal Best) replays for any given map. These can usually be uploaded to MX.

To easily find a replay that was recently saved, sort the folder by "last modified".