This has been referenced on CZ by other posters in the past.
He references getting Dak to change from what was called in the video below.
I reviewed the play he references on the All-22.
Dak looks left then goes deep to Cooper on the right.
If Dak was going to throw to Cooper on original stop route, Dak wouldn't look left first.
Cooper has done many interviews where he goes into much more detail.
There are local media interviews like the post game with Brad and Babe.
I DVR those during the season but don't save them forever.
There a dozens of pages on the Cowboys website with links to their videos.
You'll have to scroll through about a dozen just to get back to this years draft.
The ones from during the season are probably there if you go back far enough.