I set up a background and content for the hero block on the home page set up in the Axioma theme. The content and background I set up and saved disappeared and now the Choose File button is not responsive so I can't set up a new background. The block has defaulted to the default that comes with the theme. It seems that I can't change it.
I'd like to understand why what I created disappeared and short of that, how I can put in a new background of my choice.