How to add a single-page?

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I created a blank file, gave it the name of Sbulletin.php, and placed it within the single_pages directory of my concrete5 folder. I then signed into a pre-existing Concrete5 page and went to the Dashboard, where I followed the links through Pages & Themes to get to the page with single pages. This page has a URL near the top, an "Add" button, then a long list of files. When I clicked on the "Add" button, I got an error message about an invalid URL address.

The documentation claims that there is an "Add a single page" form at the bottom of the page. What did I do wrong? I tried to edit the existing URL at the top of the page, but all I could do was highlight a portion of the URL. How do I add a blank single-page?

 
ScottSandbakken replied on at Permalink Best Answer Reply
ScottSandbakken
Try using all lower case letters.
vealface replied on at Permalink Reply
Thank you! Changing to lower case did the trick!