Unclear How to Load Saved Structure Files [Windows 10]

Goal: To save a structure file using a structure block to my Documents folder in Windows 10, then launch a different world and load the saved structure file. 

Problem: It's not clear where on the Windows 10 file system the user must place the saved structure file for the Minecraft client to see them using the mystructure:<structurename> syntax. 

Should there be a Load from Disk option that lets you browse for saved structure files?