P.S. I see that you use png images. They are huge and not optimized https://prnt.sc/1dxki41
1) Replace them with jpg images and optimize using https://tinypng.com/
In another case, your product will loading forever https://prnt.sc/1dxlfz7 – 402MB – OMG.
Let me know when you optimize this product images and we’ll be able to proceed with the gallery test. Because it’s impossible to work with this product normally because of the page size.
Regards