Hopefully, this isn't too off-topic or repetitive.
I'm writing my dissertation, and I am finishing up the last chapter discussing some of the experiments I did. In that chapter, I discuss a pump I ordered from a seller on Amazon, and the website has a perfect exploded view CAD drawing of the pump for my use.
I want to use this image, and I have already contacted the seller in the comments to see if I can use the picture. But I'm not sure I will get a reply.
I've looked online and found resources that say I can use the image without citation, saying it falls under fair use. Others say that I need to get written permission from the seller and from Amazon itself. This question says it's all about copyright, and I agree; I don't know 1) whether the image is copyrighted or 2) who to reach out to to get the most direct reply.
Are the images the seller uploads on Amazon copyrighted? And if so, can I go to the author or should I contact someone at Amazon directly?