I am a little confused of to what demos are in speedrunning and how exactly it 'verifies' a run. Do you put it into your portal folder and it does a video of some sort (by this I mean does it read inputs you put in or watch a video)?

Demos are recorded files during a run that saves a shitton of info : inputs, used commands ... etc Use Maxxuss' demo recorder plugin to do that for RTA speedruns.

Thanks :D