Memory Replay Streamer not working

I don’t know if I’m just wrong about how I’m going at this but I have a problem with setting up a Memory Replay Streamer, the Null Streamer works, but the Memory Streamer seems to record, but when I play the recording, it locks the Camera at the world origin and nothing happens except for the log being spammed with “DemoNetDriver out of date”.
I do have a suspicion, the documentation of the Memory Streamer says

The Memory Streamer keeps a user-configurable running length of replay data in memory

and I just never set the length the Memory Streamer should record, I thought it might have a default length, but if the default length is 0, that could explain why there is no replay.

Does anyone know how to set the replay length?