When a product is available with 360 degree view, it should shows this button
And you will be able to see your product images in 360 degree view
The 360 Degree view is actually show your product images in different view angle each image. You might need from 24 to 72 images, the bigger number of images, the smoother your 360 Degree view.
Add more images to your product by go to the product page editor, find the Product Data panel and click on Gallery 360 tab
Up load your images list here, remember the image order or your 360 Gallery will be affected.
When your gallery images is ready. Save your work and the 360 Degree View button should appear on your Single Product page