Adding custom cards not working

I followed the Custom Cards documentation, but I am not able to load any custom cards.

I have created the file per instructions in the <config>/www/content-card-example.js folder. When I follow the instructions to Reference your new card, it states,

will be accessible in your browser via the url /local/

However, <ip>:<port>/local gives me a 403 Forbidden error.

I’ve added content-card-example to the Dashboard Resources via the UI, but when I try to actually make a card with - type: "custom:content-card-example" I get the error Custom element not found: content-card-example

What am I doing wrong??

P.S. Yes, I’ve rebooted HA