Upgradability of iMac 21.5 inch
I am planning to buy an iMac 21.5-inch Retina 4K but I would like to know how much upgradability there. I know that the RAM is upgradable up to 64GB. I am buying one with a 1TB Fusion Drive, but can I change this to an SSD after purchasing? Since Apple charges a lot for extra storage and RAM. Can I also upgrade the processor? It comes with a Core i5 but if it is possible I would like to upgrade to an i7 at minimum.