I don’t know how to upload a 360 degree image. I have downloaded test images but it doesn’t work for me from Amazon. I don’t know if I use a specific extension.
There are no any requirements for image dimensions but to achieve a smooth effect they have to be equal. Some images should be enough to create a 360 view effect.
Also, you can import the “360 degree view” page via WoodMart -> Pre Built websites and check the images.