When a page is not found on your native or web app, our servers will send an error, called error 404.
This can happen when the content has been removed or moved, or the URL typed incorrectly.
The page sent by the servers to indicate the presence of this error is a generic page called 404 page.  

In the menu Publish > Administration> 404 error of your back office, you can customize this page.

You can display  a text, edit its content, font and colours and add a picture of your choice (1024 x 1024 px).
You have a preview on the right part of your back office page.

Don't forget to update your modifications in the menu Publish > Changelog of your back office.
 

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