portfolio item not showing after publishing

Hi,

I’m building a portfolio with a custom name (see previous conversation here).
Now i’m trying to publish my items and even though they are ‘published’, they don’t show under the portfolio page, and even when I click on preview, it shows that the page is not found. Not sure if it’s related to the custom title, not sure how to fix that, and not sure what you need to help, but any help will be greatly appreciated.

Thanks!
Nathalie