https://docs.bigcommerce.com/developer/api-reference/rest/admin/catalog/products/images/update-product-image
Update Product Image | BigCommerce Docs
Updates a Product Image. Usage Notes - imageurl - 255 character limit - Each image file or image uploaded by URL can be up to 8 MB.
update product imagebigcommercedocs
https://scayle.dev/api-guides/admin-api/resources/product-images/update-product-image-position
Update product image position | Product images | SCAYLE
update product imagepositionimagesscayle