Posted today on the Yes Source YouTube channel is a profile from 1987 by broadcaster Dan Neer (who conducted a great interview with Trevor in 1989) which journeys through the history of the band and current activities, with commentary from all the guys.
There is one comment from Trevor I find highly-amusing: when he characterizes record company A&R personnel from the 1970s as "drug addict hippies," meaning people from the counterculture had found their way into the structure of corporate distribution.
Although this is posted as two parts, it seems as though part one is an edited version - taking out the songs which were included - but part two is the unedited version.
Part one:
https://youtu.be/stYaUyFkKiI
Part two:
https://youtu.be/L1C34ZK6CoQ