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John, click the second tab on the top right of the reply window to put the photo up.
If that's your left elbow, and after seeing some of the follow through on your forehand returns in the Yuba Open video, my educated guess is that it's from swinging upwards really hard.
I was getting the same area in bad pain and began swelling right there. I was doing the Nadal followthrough, finishing over my head, yanking really hard to get more racquet head speed.The forearm hurtles upwards and starts to pull the elbow out on the outer edge. The tendons which holds it gets inflamed on the lateral epicondyle. So the bundle of collagen fibers get messed up.
Cortizone is one treatment method for people who have to continue playing. But that may not work long term. Shockwave treatment also another. I got rid of mine by just limiting the amount of time I swung upwards, and stopped yanking up on the stroke. I am using the Djoko forehand method instead partly for this reason.
I saw one return for sure where you finished above your head. I was admiring it because it looked like you were going across from the start, but you ended up high. It's around the first two minutes of the video.
Maybe then, you have to consider it is your kick serve causing it. You definitely twist the forearm at a high degree of rotation from what I've seen.