Can I add up a bunch of demos using playdemo?

I've got all of my demos from my run and want to record them for my yt. I've done this with tf2 demos, using lawena. I'm 99% sure you can't use lawena with Portal. What's a good alternative for doing so? And does it have a queue option? (So I can add up all of my demos and record them)

Thanks, figured it out myself lol

I recorded a run with the demo recording tool, found in the resource tab here. I have all of my demos in a folder, but when submiting a run, where do I send them? (It also included the vault save)

Thanks!