Okay thank you. The link was meant to show what plugin I was using to record my Portal runs. I found out from another forum that most mods accept a compressed file with each demo individual demo piece.

I have recently begun speedrunning Portal, and I am using the speedrun auto recorder from https://github.com/RedHaze/speedrun-demo-record-unified. Is there a way to combine the demos it puts out into 1 large demo?