I could not try this, since I didn't have the domain yet. Now I do.
When I go to FTP, and I put the file in there, it's there. When I reconnect or go to the site, It's not in there.
EDIT: It's because it's a secured file. I got in the File Manager and there it was.
Now I edited it like you said, excactly that but it doesn't work.
FINAL EDIT: It was because the page did not excist. It works totally fine now. Thanks <3