CSS Include "CSS file URL" field— where do I go to the file that is stored there so that I may edit?

[tdQ1w7xO6k]

The `url` field for a CSS Include record has a link in it, and if I just click on it, I'm taken to a read-only page with CSS on it. I want to edit it, however. How do I do this?

[Weird]

As far as I know you can't modify the OOB ones.
You'd have to make your own or override the values elsewhere.

[tdQ1w7xO6k]

If I make my own for Source: URL, where do I make it?

[Weird]

Or you can just create it directly I suppose.
CSS include supports source and URL. Source allows you to use a sp_css record.
So you could just replace the include with your custom one that's pointing to a custom sp_css record.