Minecraft Structure Block Won't Transfer Between Worlds

I saved a structure in one world, then was going to put it another for people to download since I had the first in a testing world. I got the structure block that would load said save (I clicked save twice when saving, and the structure block was acquired through Ctrl + Middle Click), and saved it to a toolbar. I got the block and that world and it wouldn't load! I got absolutely nada! Can anyone help?