Sorry, I don't have the video.
But usually, the wider the feet straddle, the easier the press and the weaker the person is!
When you are in a straddle L and begin the press, the closer the feet come to the arms, the harder it is, because that means you need to get your hips up higher, which is the hard part.
Here is a comparison:
In this video, the girls legs remain apart during the press:
Here, Maile is doing a great job bringing the feet close to her arms:
Not the best examples, but I hop you get it and it helped a little, although I don't have that video!