One address, read by the person who does the work.
The apply page is the faster route: it asks the four things we need to look at a catalogue. The address above works too, in which case include a link to your channel and a line on where you'd want clips to go. What working together looks like is on the for creators page.
Include the clip link and, if you are not the creator, what right you believe is affected. Creator removal requests are honoured; see the for creators page and the terms of service.
Questions about how clips are made are probably answered on the how it works page or in the FAQ; if not, the address above reaches the person who runs all of this directly.