Using Gems to Buy More Loot for Upgrades Even Though The Storages are Full?

I was unable to find sources on the internet to test this, but with personal tests I can prove that you cannot purchase more resources than your storages.

First the store can only allow you buy % of your total storage: enter image description here Secondly, when you try to purchase more loot than what you have it will say Build Or Upgrade Existing <Type of Storage> Storages!