Thank you Will! 
   I think that everything is applied correctly.   
 I have indeed quite a few sites with Hotcakes and all of them are working perfectly well. Here is rather issue that I cannot figure out for to add domain2.com (or where to edit it) in order for the images to show correctly.   
 The current url points to for example: 
 http://portals/1/Hotcakes/Data/products/b3c9b5fd-3396-499e-a25d-76c0f3e8g020/additional/5e7f2a5d-0fa9-4295-ab77-452a0fe6eef7/tiny/testpic.jpg   
 That is on the product detail view and category view.   
 And on Hotcakes backoffice images are not appearing for the same reason:  
https://portals/1/Hotcake...8g020/medium/testpic .jpg   
 However on domain1.com – which is portal/0, images are perfectly fine and image url is for example: 
 https://DOMAIN1.COM/Portals/0/Hotcakes/Data/products/c89c77f9-50d3-4ca3-94e7-451fc3cd4362/medium/pic03.jpg   
 So for some reason DOMAIN2.com is not popping info images on portal/1.   
 Can you advice please which files I should look into to change this?   
 Many thanks.   
 Sorry for posting this into wrong category.