4K textures on iOS device

[danilokrulj]

I found an example where (i think) a shopify page uses model-viewer to showcase 3d models, but the thing that interested me was that they can use 4k textures on a model and it is usable in AR. However, when I use 4k textures through model-viewer they get downgraded or even crash the page on iOS. How is this possible? Is there a way to allow 4k textures?

This is the page in question:
https://www.emilbenz.com/products/weekender-4-pebble-clay

[danilokrulj]

After closer inspection it appears that they use model-viewer 1.12, and after a little testing I found out that a model with 4k textures which crashes the page on iOS on the latest version of model-viewer, doesn't crash the page on the older version (1.12). How is this possible? Does anyone have any idea what could be the issue?