How to test custom structures

Hello ^-^ I have just finished following the custom structures generation docs from datapack hub on planet minecraft. I made an example structure (just a cube that spawn in the world), and filled out all the files. I /reloaded and flew around, and could not find it, and the /locate command didn't seem to recognize the structure existing. Is there anything else that I need to do to make the structure generate, or perhaps did I make a mistake somewhere? I linked images of my code files. Thankyou in advance!