Make sure you are editing the UI config in the dist folder of the built nitro files as well as the source. If you only change source, that is why you are rebuilding.I can't find this option can you show me a screenshot..
I don't see the ''option open in a new tab when I right click on the image on my browser.Good! To be sure, open your hotelview. Right-click one of the changed background images, open in a new tab and refresh the tab! That way it should always load the "latest version" of that file. Apart from the client